• Home
  • About Me
  • Privacy Policy
  • Nav Social Menu

    • Facebook
    • Instagram
    • Pinterest
    • Twitter
    • YouTube

My World Their Way

Screen free Activities & Ideas for Families | Hands on Learning Activities for kids

  • My World Their Way
  • At Home Learning
    • Math
    • Literacy
    • Science
    • STEM
  • Kids Activities
    • Art and Craft
    • Games
  • Books
    • Books for Kids
  • Parenting
  • PRINTABLES
    • Coloring Pages

Magic Number 9 – Multiplying with 9’s

“How can I make math fun for my boys” is always an ongoing task for me as it always keeps them engaged and interested in math. They actually look forward to these games and are equally curious to understand and solve the mystery of Math.  How boring it would be if you have to do the same math worksheets every day.  How about we show them how fast they can multiply large numbers with the magic number 9. In the next couple of days, I would be sharing all the math tricks and games I use to teach my kids with my blog friends, so stay tuned.

There is a quick and fail-proof method of multiplying with 9’s. Any mathematical calculations done with magic number 9 would produce some interesting numerical patterns. 

To multiply a number N with 9’s, divide the result into two sections – the left section and the right section. The left section would be ( N-1 ) and the right section would be ( 9’s – N ) +1 . The left section and right section together would be your final result.

For example,   4576 × 9999  = 45,755,424. The left section of the result would be the number 4576 – 1 = 4575 and the right section would be 9999 – 4576 = 5423 and adding 1 to it which would be 5423 +1 = 5424.

Let’s try with some other number, may be  853. So, if multiplying 853 x 999 = 852,147. The left section of the result would be 853 – 1 =  852 and the right section would be 999- 853 +1 = 147.

So, leave your calculators aside and have fun multiplying large numbers with 9’s in a fraction of a second

You can find some interesting patterns involving multiples of 9  here.

Want to learn more math tricks to do faster calculations, then check out these books on vedic mathematics.

If you would like to remain updated with all the new exciting posts, please consider following or liking my facebook page.

Happy Calculating !

While you are here, check out some of the latest posts

  • CHRISTMAS MATH COORDINATE GRAPHING ACTIVITY
  • WHAT IS A COORDINATE GRAPH ?
  • SEQUENCING PUZZLES
  • 2023 – NEW YEAR MATH PUZZLE
  • MONDRIAN STYLE FIBONACCI GNOME HAT
Tweet
Share
Share
Pin
0 Shares
«
»

Math 1

Subscribe

Reader Interactions

Comments

  1. Fractioncalc says

    March 2, 2019 at 5:40 pm

    I would like to share a few tricks which i found cool.

    Two digit number and its reverse always divisble by 11

    The sum of a two digit number and its reverse is always divisible by 11

    eg (66+66/11 =132/11=12)

    89+98 /11=17 etc etc)

    Magic of 37

    any 3 digit number where all the digits are same is divisible 37.yes!! 333,444,555,666…all are divisible by 37
    Mental Multiplication with 11

    multiplication by 11,for eg 35*11=385(3(3+5)5) keep the first and the last digit same and the middle digit is the sum of the two
    multiplication of numbers with same tens digit

    23*27=621.

    step1: 2*(2+1)=6 is the first digit.

    step2: 7*3=21 second digit

    multiply numbers between 11 and 19.

    eg) 18*14=252.

    step 1: 18+4=22

    now add a zero at the end we get 220

    step 2 :multiply the right most digits 8*4=32

    Add 220 and 32

    we get 220+32=ans

    The sum of 5 successive whole numbers is always divisible by 5

    eg) 6+7+8+9+10=40 which is divisible by 5

    The product of 3 consecutive natural numbers is always divisible by 6

    eg) 6*7*8=336/6=56

    The product of 3 consecutive natural numbers is always divisible by 24(if the first of the 3 natural consecutive natural numbers is even)

    8*9*10=720/24=30

    The last digit of the product of any 9 consecutive natural numbers is always 0

    eg )(1*2*3*4*5*6*7*8*9=362880)

    (as the product of any 5 consecutive natural numbers is always 0)

    mentally squaring for 5

    eg) 35*35=3*(3+1)…..25=1225

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Primary Sidebar

  • Facebook
  • Instagram
  • Pinterest
  • Twitter
  • YouTube

Get connected

Subscribe to our newsletter to get updates on all our latest product releases, sales, and some free goodies!

Hooked On Phonics

Search all of my posts

Categories

Our Privacy Policy

  • 20+ SCIENCE EXPERIMENTS FOR KIDS
  • FREE PRINTABLES
  • Privacy Policy

Amazon Affiliate Disclosure

I am a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.

Footer

About the Designer

Follow on Instagram

Instagram post 18270364312104281 Instagram post 18270364312104281
GIVEAWAY CLOSED. Winner is @Teachingnextdoor . Con GIVEAWAY CLOSED. Winner is @Teachingnextdoor . Congratulations ! 
📣TPT is having a site wide sale on November 28th and November 29th , and I’d love to gift one of you with a $10 TPT gift card! 📣

To enter, simply:
Like this post
Follow me @myworldtheirway
Tag a friend
Comment below with an emoji

Bonus entries: 1 bonus entry for following me on TPT. Enter separate comment below for that 😄 (link in bio - Worksheets by Sush ) ⭐️

Check out my store during the sale- all my products will be on sale 🤩

Winner will be contacted by private messenger! Contest ends November 26th. Good luck!

( P.S. : Sale starts on November 28th at 12:01am ET and ends on Tuesday, November 29th at 11:59pm ET )

This contest is not sponsored, endorsed, or affiliated with Instagram or Facebook. Participants must be 18+. Contest ends on Saturday, Nov. 26th at 8 pm PST. Entries will be verified and a winner will be announced in time to shop the sale!
Make a Christmas Tree Tessellation. A fun math art Make a Christmas Tree Tessellation. A fun math art project to do with kids. #christmas2022
Who says #halloween has to be all about spooky thi Who says #halloween has to be all about spooky things ? Solve these fun rebus puzzle aka picture puzzle and get into the holiday spirit !

#halloween2022
#halloween
Recently, we decided to learn the different art fo Recently, we decided to learn the different art forms and techniques used by different artists by creating our own unique artwork using their methods. And what can be better choice to start with than using Eric Carle’s  art technique to create the vibrant and colorful bugs as illustrated in his most famous book ‘The very Hungry Caterpillar’ .  What will you create ?
As a math lover, all I see is a #fibonacci pattern As a math lover, all I see is a #fibonacci pattern in the spirals of Romanesco Broccoli. Math is everywhere around us. Love the variety of vegetables and fruits offered at #saratogafarmersmarket
🔸 WHY DOES A BALLOON AMPLIFY SOUND 🔸 When y 🔸 WHY DOES A BALLOON AMPLIFY SOUND 🔸

When you think of speakers, loud sounds are typically the first thing that comes to mind. Speakers have amplifiers built in to make sounds louder. But did you know that a balloon may also be used as an amplifier to boost the volume?

Find out how in this science experiment for kids! 

https://myworldtheirway.com/2022/01/balloon-amplifier/

#scienceexperimentsforkids #kidsactivities
🧩 NEW YEAR MATH PUZZLES 🧩 Put your math ski 🧩 NEW YEAR MATH PUZZLES 🧩

Put your math skills to the test with some fun new year’s activities. We've got puzzles and exercises to get you in the spirit for celebrating the holidays and kicking off the new year right by exercising your brain.

https://myworldtheirway.com/2022/01/new-year-2022-math-puzzles/

#newyear #puzzles #kidsactivities
🔸 LOGIC PUZZLE - FORK IN THE ROAD 🔸 A logic 🔸 LOGIC PUZZLE - FORK IN THE ROAD 🔸

A logician went on vacation to an island. There were two different tribes that lived on the island. One tribe always told the truth and one tribe always lied. When he reaches to a fork in the road, he must ask a local person which way to go to reach the village. The logician has no way of knowing if the person is telling the truth or lying. He pause for a bit, then asks only one question. He knows which path to take based on the response.

What question does he ask?

Let us know your answer in the comments or find out the answer here 

https://myworldtheirway.com/2021/12/fork-in-the-road-logic-puzzle/

  #puzzle #logicalpuzzle #kidsactivities
Follow on Instagram

Subscribe for Updates

Copyright © 2023 · Darling Theme on Genesis Framework · WordPress · Log in