The post How to build a Straw Bridge – STEM Activity appeared first on My World Their Way.

]]>To begin the activity, we looked at a couple of pictures of various types of bridges ( Golden Gate Bridge in San Francisco , The Tower Bridge in London , Sydney Harbor Bridge, and different bridges especially in California HERE ) and I asked my kids.

- What shapes do you see in these structures?
- Which parts of the structure do you think help most for making it really strong? Why?
- Which shapes do you think most help the structure become strong?

We talked about how triangle is the strongest shape and used in most of the bridges. And we tested it ourselves before building the bridge model. Kids quickly grabbed some toothpicks and clear tape and made different shapes to check and see which shapes are rigid or flexible when gently pushed on one corner.

I then showed them a simulation of the strength of different shapes in a building HERE.

Now it was time to look at the different types of bridges and the forces acting on them before beginning to build one : Beam, Arch, Cable-Stayed, Cantilever, Suspension and Truss.

**Beam**: Beam bridges are the oldest bridges known and prove to be the easiest to design and build. These bridges are horizontal and supported at the end of each side. This form of bridge rests on the top of the beams that pressing straight down on both ends of the bridge.

**Arch**: Arch bridges are arch-shaped. They have supports on each end, and the both ends of the abutments bear the center weight of the bridge.

**Suspension**: Cables are used for carrying suspension bridges. The cables are suspended from towers connected to cofferdams. Such blocks are deeply mounted. in the water’s surface or body.

**Truss**: Truss bridges have a sturdy deck and a frame of girders on the sides. They are build either by putting many triangle frames together or by using a pyramid style frame.

**Cable-stayed**: Closely resembling suspension bridges, cable-stayed bridges are supported by cables except they use fewer cables. The towers that hold the cables are much shorter than suspension bridges. (Tatara Bridge)

Kids were eager to start their STEM activity and build a straw bridge of their own. They first made a design on the paper, discussed and tweaked it, and went on to build their own bridge, tested it and then made modifications to make it stronger.

It was time to test both the models.

and both the models did fairly well under the weight.

We then discussed about the engineering element behind the design of a bridge.

- How you think this information is used by engineers and architects while they are building ?
- Which sorts of events are likely to push and pull on real life structures ( Gravity, water, wind etc ).
- What factors the engineers take into consideration before constructing the bridges.
- How far does the bridge need to stretch? A very short span or fairly long distance.
- Does the location where a bridge is being build a crucial factor ? Is the ground firm enough to take large abutments for an arch? Is there a good bedrock where suspension cables can be anchored ?
- If the bridge needs to cross a river, how can piers and towers be safely plunged into its bed so the flowing water doesn’t scour them away.
- How much load the bridge has to bear ? Will it hold railroads, cars and pedestrians.

- How will architects and engineers decide to have rigid structures ? When could they want them to be flexible?
- Most bridges are designed to be primarily rigid, but with an expected amount of flexibility so that they can withstand strong wind or earthquake.

- How can engineers increase the ability of a building to withstand earthquakes ? What is a cross brace ?
- Using the square shape kids made before, add a 5th toothpick diagonally. The shape is now divided into small triangles and gives the initial square model more stability. This is called cross brace.

The kids then watched the video to learn more about the strength and weakness of each type of bridge.

If you’re looking for more STEM activities for kids, check them out HERE.

- How to build a Straw Bridge – STEM Activity
- Red Cabbage Science experiment – pH indicator
- How to make a Protractor with Paper
- Plastic Bottle Toy Car
- Water Drops on a Penny – Science Experiment

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]]>The post Nim Game appeared first on My World Their Way.

]]>- Start with setting up as many stacks of counters as you want and each stack can have as many counters as you like. For example, you start with 3 stacks of counters, the first with 7, the second with 5 and the third with 3.
- Players take turn removing any number of counters from any one of the stack. The player must take at least one counter on their turn.
- The winner is the player who picks up the last counter.

I wanted to introduce my kids to a basic version of the NIM game and build on their problem-solving skills to find a strategy for solving Nim Game with multiple stacks of counters.

First, set up only one stack of counters and ask your kids if they want to go first or second ? Of course, children always want to go first and win. So hopefully, they will go first and grab all the counters and win. If not, grab all the counters on your turn and you will be the winner. Now set the game up again, and ask them if they will want to go first or second ?

So far, the game is pretty simple but it showed my kids that if they have one stack of counters left on their side, they’re winning.

Next, play a simplified version of the two stack Nim game with just one counter in each stack. Ask your kids again if they want to go first or second ? Your kid will be quick to guess that going first is a guaranteed loser ! No matter which counter they choose, you can take the other counter to win.

So, the strategy for two stack Nim game is to get the counters down to a single counter in each stack on your opponent’s turn for you to win.

Now, setup two stacks with two counters in each stack ? Can you figure out the winning strategy for this one ?

The basic idea to winning is to try to make it so your move makes the stacks equal. On your turn, take counters off the bigger stack until both stacks are equal. This way, you compel your opponent to make the stacks unequal on their next turn, and you can evenly balance the stacks again on your turn. So no matter what the other player does, you copy their move and keep the stacks equal. In the end, you will win, because the other player will inevitably have to finish a stack and you can finish the last stack.

For this strategy to work, in order to win, you need to be in a position where you can make the stacks equal. That is, if the stacks start unequally the first player has a winning strategy and the second player otherwise has the winning strategy.

Play the game with two stacks and more counters to see if the strategy always work.

Once you have played the game a couple of times, ask your kids about different strategies to win the NIM game ?

- Can you generalize to have a winning strategy for any number of stack? When is it advantageous to be the first player? Second player?
- How can you win NIM when you are playing with three stacks? Does one of the players have a winning strategy? Which player do you think? Check out the HINT

The game of NIM teaches kids about problem solving. You can also find 30+ Critical thinking puzzles HERE.

Let’s stay connected. You can follow my facebook page at My World Their Way.

- How to build a Straw Bridge – STEM Activity
- Nim Game
- Multiplication Buzz
- Target Number- Order of Operations- Math Card Game
- Red Cabbage Science experiment – pH indicator

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]]>The post Multiplication Buzz appeared first on My World Their Way.

]]>- This game can be played between 2 players or more.
- First, determine which number’s times table you need to revise ( choose a number from 3 – 9 ).
- The first player says number 1, to start the game. The next player says the following number ie 2 and son on. Players take turns counting the next number and so on.
- When a multiple of the chosen number comes up, the player doesn’t say the number but instead says “BUZZ”.
- The next player says the following number and the play goes on until one of the player makes a mistake.
- For instance, if 6 is the chosen number, it would sound like this to count around the players – 1, 2, 3, 4, 5, BUZZ , 7, 8, 9, 10, 11, BUZZ, 13, 14, 15 and so on.
- The game ends when one of the players counts till the 12th multiple of the chosen number.
**Note**: If only two players are playing and the number chosen is an even number, then only one player will always get the multiples of that number and will have to say the word BUZZ. Therefore, when only two players are playing, it makes sense to use an odd number as the chosen number.

Here are few more math games that require minimal supplies and are so enjoyable to play and bond with your children as they practice their math skills in a fun way.

- Target Number – A Math Card Game to practice Order of Operation.
- Fence me in – A Strategy Game to practice the concepts of Area and Perimeter.
- Flip Ten – A math card game to practice addition facts
- Tens Go Fish – A math card game to practice addition facts

I hope you and your kids have fun playing the Multiplication Buzz game. Let’s stay connected. Here is my blog facebook page My World Their Way

Disclosure : Some of the links below are affiliate links, meaning, at no additional cost to you, I will earn a commission if you click through and make a purchase

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]]>The post Target Number- Order of Operations- Math Card Game appeared first on My World Their Way.

]]>- Two decks of cards ( remove Jack, Queen and King ). Ace equals 1 .
- 2 players
- Paper and pen

- Deal five cards to each player.
- Flip one card from the top of the deck and place it in the center. This card will be the target number.
- The goal of each player is to use the cards in their hand to add, subtract, multiply or divide to reach the target number.
- Each player must try to use all five cards, but must use at least 2 cards.
- If a player can make the target number, he/she will write the letter “T” from the word “TARGET” to a piece of paper.
- For example, if the target number is 5, and the player has a 2, 7, 2, 3, 3, he/she could use one of these equations : “3+2” or “(3+3)/2+2” or “(7+3)/2” or “(7 + 2 + ( 3×2))/3”.

- Players must then discard all of the five cards in their hand along with the target number card.
- Five more cards are dealt to each player and a new target number is placed in the center. The play continues until one of the players has written all the letters of the word “TARGET”.

**Tens Go Fish**is a mathematical adaptation of the classic “Go fish” game. And it helps to practice the combinations of ten.**Flip Ten**is a spin off of a traditional*memory match*game to practice the addition facts and learn the combination of tens

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(Disclosure : Some of the links below are affiliate links, meaning, at no additional cost to you, I will earn a commission if you click through and make a purchase. )

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]]>The post Red Cabbage Science experiment – pH indicator appeared first on My World Their Way.

]]>- Red cabbage
- Vinegar
- Baking Soda
- Lemon Juice
- Water
- Couple of glass cups
- Sieve
- dropper or pipette ( optional )

- Finely chop some red cabbage leaves and place it in a bowl.
- Pour boiling water over them and keep it aside for 10 minutes.
- Strain the liquid from the cabbage mixture into a glass cup. It should be purple- violet in color. This is the ph indicator solution.
- Now, prepare the acidic and basic solutions for the experiment. Fill different glass containers with the following solution.
- Lemon Juice
- Vinegar
- water
- A teaspoon of Baking Soda mixed with water
- 2-3 teaspoon of sugar mixed with water

- Drop a couple of ph indicator solution( red cabbage water ) into each of the cup and notice how the color changes in each one of them.
- The color of each solution will change based on its pH level. It will transform into various shades of red in an acid, likewise for a base it will have various shades of green and, if neutral, a purple hue.

The pH scale is an important indicator of how acidic or alkaline a solution is. The scale ranges from 0 to 14, 0 being the strongest acid, 7 being neutral, and 14 being the strongest alkali.

Red cabbage is a perfect pH indicator because its leaves contain a pigment called anthocyanins that are responsible for many of the red/purple/blue colors found in fruits and vegetables. Anthocyanins molecules change color depending on the pH of the solution they are in, making them useful as a pH indicator.

By placing the red cabbage in boiling water, we extracted the pigment molecules into the water solution. When mixed with various solutions such as vinegar, lemon juice, baking soda solution, it changes color depending on the pH of that solution. The color found in neutral solutions is purple. The effect is a red color as the solution becomes more acidic. Increasing the pH in basic solutions change the color from blue to green and the solution is found to be greenish-yellow at high pH.

You may also use red cabbage juice to create paper pH indicator strips. To make pH indicator strips, cut some strips from a clean coffee filter paper. Let the strips sit in red cabbage juice for a while. Eventually, remove the strips from the juice and allow them to dry completely. They should be light purple or light blue in color. Once the strips are completely dry, you can use them to test the pH indicator of different solutions. Just dip the strips into the solution you want to test, remove it and look for a change of color. The acidic solution will make the strips red and the bases will turn them green.

I hope you’ve had fun making beautiful colored solutions in the red cabbage pH indicator science experiment. If you are looking for more science experiment, then check out some of them HERE.

Let’s stay connected, here is my blog facebook page My World Their Way.

(Disclosure : Some of the links below are affiliate links, meaning, at no additional cost to you, I will earn a commission if you click through and make a purchase)

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]]>The post Fence me in – An Area and Perimeter Strategy Game appeared first on My World Their Way.

]]>- Graph Paper
- Two 6 sided dice
- Two different colored pencils

- Each player take a turn to roll the dice.
- On each player’s turn, they need to multiply the two numbers on the dice. Then, outline a rectangle on the graph paper with its area or perimeter determined by the product of the two numbers on the dice.
- Here, the player need to think about a strategy, whether to use the area or the perimeter of their rectangle in the fence me in game.
- For example, if a player rolls 6 and 5 then the product will be 30. The player will then determine whether the product is to be used as the area or the perimeter of their rectangle.
- If they choose to use it as an area, they can draw a rectangle with any dimensions like 6 by 5 or 3 by 10 or 2 by 15 as long as the product remains the same.
- Similarly, if the player decides to use it as a perimeter, they can use any dimensions for perimeter like 6 and 4, or 7 and 3 or 5 as long as the total perimeter of the rectangle equals the product of the numbers on dice.

- To draw an outline of the rectangle, each player uses a different colored pencil to make it easy to count rectangles at the end of the game.
- Play continues until one player is unable to draw a rectangle on the board.

- The rectangles drawn on the game board may touch each other but may not overlap.
- A player loses a turn if he/she rolls a dice and is unable to draw a rectangle.
- At the end of the game, each player adds up the total number of rectangle they’ve fenced in. The player who’s been able to fence the maximum number of rectangle area wins.

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]]>The post Walk through a piece of paper – the Math behind it appeared first on My World Their Way.

]]>- A4 sheet paper
- Scissors

You can also print out a template to make it easier for young children HERE. The aim is to cut the paper in any shape you think suits, but you can’t cut the paper all the way through it. You can not use any other material and you can’t glue or fix any of the paper.

Fold the paper in half along its long side. Place the paper with the folded side closet to you.

Starting about 1 cm from one end of the paper, cut a slit from the folded side of the paper leaving 1 cm uncut at the end so you don’t cut all the way across the paper.

Turn the paper around so the fold is away from you. Along the loose end, cut another slit 1 cm apart from the last cut, and stop about 1 cm before you get to the folded side.

Alternate between cutting from the folded end and the loose end and finishing on the folded end until you’ve reached the other side of the paper. Keep all the alternating cuts 1 cm apart and make sure you don’t cut all the way through.

Now, you will notice a series of folded slits along the folded side, cut along the fold of each of the slits except the first slit and the last slit. Leave them untouched.

Carefully unfold the paper and you should have a large loop that you can fit your body through.

By cutting a long continuous maze like path in the paper, you have created

a “hole” that is apparently larger than the paper itself. We know that multiple rectangles can have the same area, yet their perimeter will be different. For example, a rectangle of 10 x 20 cm has an area of 200 cm and a perimeter of 60 cm. Similarly, a rectangle of 1 x 200 cm has the same area of 200 cm but a perimeter of 402 cm. Using the same concept, you have created a loop that is big enough for you to walk through. The area of the sheet of paper remained the same throughout the activity – the size of the paper was not changed at all because none of the cuts went all the way across the paper

The original paper perimeter did not allow you to cut a hole that would be large enough to fit through. However, a new and much longer perimeter is created by cutting slits back and forth in the folded paper. The length of this perimeter is limited to how narrow a slit can be cut. The narrower the slits, the longer the perimeter, and the bigger the hole.

Are you looking for more hand on activity for your teaching, here are some of our picks.

- Make your own Protractor using a Piece of Paper
- Perimeter Magic Triangle
- The Four’s Four Puzzle
- Quadratic Equations using 6 coin puzzle

Let’s stay connected, here is my blog facebook page My World Their Way

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]]>The post Sloth themed Scratch-Off Father’s Day Card appeared first on My World Their Way.

]]>- Cardstock
- Silver or Golden acrylic paint
- Paint brush
- White crayon
- Scissor
- Pen
- A penny to scratch the card

Print out the pattern and fold the paper in half to make a card.

Download it HERE.

Write the message for your dad in the heart shaped box.

In a plate, combine two parts acrylic paint with one part dish soap. Mix them together with the paint brush gently to prevent the mixture from creating suds.

Color over the heart with the message using white crayon. Press firmly and make sure the crayon wax completely covers the heart shaped box. Any areas that are not colored will collect the paint and can not be scratched.

Use the paint brush to apply the paint-soap mixture to the heart shaped box in thick strokes. Let it dry and repaint over it again.

Once the paint is dry write a sweet message to your dad inside the card and brighten his day with this lovely card. Attach a penny if you want so that he can scratch it off to reveal the message.

Surprise your dad this father’s day with your own home made sloth themed scratch-off card to show how much you love him.

What if you don’t have acrylic paint ?

- You can always use posted paint. They also work fine.
- Do you have an old nail polish lying around. Use that instead of acrylic paint.

What if you don’t have white crayon ?

- Instead of the white crayon, cover the message with a clear adhesive tape and paint over it.

Here are some more craft ideas for kids

- Sloth themed Scratch-Off Father’s Day Card
- Plastic Bottle Toy Car
- I Love you – Math Equation Card
- Free Printable Mother’s Day Coloring Pages
- Mother’s Day Lilac Card Craft

Let’s stay connected, you can follow me at MyWorldTheirWay

( Disclosure : Some of the links below are affiliate links, meaning, at no additional cost to you, I will earn a commission if you click through and make a purchase )

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]]>The post Father’s Day Printable Cards appeared first on My World Their Way.

]]>How adorable are these hanging dad and baby sloth.

Hanging Together Sloth Printable

This is definitely going to bring a smile on Dad’s face.

Best Dad in the World Printable

Show your Dad how much you love him with this geometric heart.

Love you to pieces Dad Printable

This is a perfect card to color and give to a sports loving dad from a sports loving kid.

Everyone deserves a little sunshine. Bring a little sunshine to your Dad’s life by coloring this beautiful card.

Sunshine Father’s Day Printable

Who doesn’t love a little appreciation every now and then. Color this card and give it as a small token of appreciation to your Dad for being the Best role model for their children.

Best Dad Appreciation Printable

Any Father’s day gift will surely be appreciated, but let him know this year with a more personalized gift how much he means to you. Every Dad will surely love these adorable homemade printable Father’s Day cards, simply because their kids made it especially for them with love.

If you are looking for more crafts for kids, check them HERE.

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( Disclosure : Some of the links below are affiliate links, meaning, at no additional cost to you, I will earn a commission if you click through and make a purchase )

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]]>The post How to make a Protractor with Paper appeared first on My World Their Way.

]]>- A square piece of paper
- a Protractor for testing the paper protractor
- a pen

Take a square piece of paper and fold it in half and then unfold it.

Pick up the upper left corner ( with an angle of 90° ) and fold so that the corner point touches the mid line you created in step 1, and move it such that the creased line passes through the top right corner of the square. This fold will create a 30-60-90 triangle.

Now fold the bottom left corner so that the fold being made lines up with the edge of the already folded over 30-60-90 triangle. It will create the second 30-60-90 triangle. Tuck it under the bigger 30-60-90 triangle you created in step 2.

Tuck it under the bigger 30-60-90 triangle you created in step 2 and mark the angles.

Fold the paper so that the remaining unfolded top right corner is bisected in such a way that the bottom right corner meets the edge of the 30-60-90 triangle you formed in step 2.

You protractor is ready and you can now find and mark all the angles on it.

Open the paper and you can see that one edge of the paper has been divided into three equal angles of 60° each.

So what’s going on? How can you prove that the right angle triangle formed in step1 and step 2 are 30-60-90 triangle ?

Let’s assume the length of the square side is 2a. The line A’B aligns with the side AB of the square when the fold is made, so it is also 2a.

In the right angled triangle A’EB, length of side BE is ‘a’ and the hypotenuse is ‘2a’. therefore it is a special right angle triangle. Hence, the angle EA’B is 30° and the other angle EBA’ in the triangle must be 60°.

Now, in the quadrilateral AE’A’B, we already know that some of the angles are 90° and 60° . Angles E’AB = 90°, angle E’A’B = 90° and angle ABA’ = 60°. Since the angle sum of a quadrilateral is 360° and the fold line BE’ is a line of symmetry, the missing two angles ( angle AE’B and angle E’A’B ) must each be 60°.

That’s how we can prove that the triangle created in the first fold is a 30-60-90 triangle.

I hope your kids will give it a try and learn how fun it can be to learn the basic concepts of geometry just by folding a piece of paper.

While you are here, check my post to prove that the sum of all angles of a triangle is 180° by simply folding a piece of paper HERE.

Let’s stay connected, here is my blog facebook page My World Their Way.

- How to build a Straw Bridge – STEM Activity
- Nim Game
- Multiplication Buzz
- Target Number- Order of Operations- Math Card Game
- Red Cabbage Science experiment – pH indicator

The post How to make a Protractor with Paper appeared first on My World Their Way.

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