DIVISIBILITY METHOS TO TEACH KIDS

 DIVISIBILITY METHODS

               FOR KIDS




A great way to enhance student learning in mathematics is to use tricks. Luckily, if you are teaching division, there are a lot of math tricks to choose from.

Dividing by 2

  • All even numbers are divisible by 2. E.g., all numbers ending in 0, 2, 4, 6, or 8.

Dividing by 3

  • Add up all the digits in the number.

  • Find out what the sum is. If the sum is divisible by 3, so is the number.

  • For example: 12123 (1+2+1+2+3=9) 9 is divisible by 3, therefore 12123 is too!

Dividing by 4

  • Are the last two digits in your number divisible by 4?

  • If so, the number is too!

  • For example: 358912 ends in 12 which is divisible by 4, and so is 358912.

Dividing by 5

  • Numbers ending in 5 or 0 are always divisible by 5.

Dividing by 6

  • If the number is divisible by 2 and 3, it is also divisible by 6.

Dividing by 7

First Test:

  • Take the last digit in a number.

  • Double and subtract the last digit in your number from the rest of the digits.

  • Repeat the process for larger numbers.

  • Example: Take 357. Double the 7 to get 14. Subtract 14 from 35 to get 21, which is divisible by 7, and we can now say that 357 is divisible by 7.

Second Test:

  • Take the number and multiply each digit beginning on the right-hand side (ones) by 1, 3, 2, 6, 4, 5. Repeat this sequence as necessary.

  • Add the products.

  • If the sum is divisible by 7, so is your number.

  • Example: Is 2016 divisible by 7?

  • 6(1) + 1(3) + 0(2) + 2(6) = 21

  • 21 is divisible by 7, and we can now say that 2016 is also divisible by 7.

Dividing by 8

  • This one's not as easy. If the last 3 digits are divisible by 8, so is the entire number.

  • Example: 6008. The last 3 digits are divisible by 8, meaning 6008 is as well.

Dividing by 9

  • Almost the same rule and dividing by 3. Add up all the digits in the number.

  • Find out what the sum is. If the sum is divisible by 9, so is the number.

  • For example: 43785 (4+3+7+8+5=27) 27 is divisible by 9, therefore 43785 is too!

Dividing by 10

  • If the number ends in a 0, it is divisible by 10.

Comments

Post a Comment

Popular posts from this blog

Griselda: Where Fact Blends with Fiction in the Cocaine Godmother's Story

Image
  Griselda: Where Fact Blends with Fiction in the Cocaine Godmother's Story Netflix's "Griselda," starring Sofia Vergara, has captivated audiences with its portrayal of the notorious drug lord Griselda Blanco. But how much of the series is factual, and where does creative license take over? Delving into the truth behind the fiction reveals a complex narrative about power, ambition, and the dark side of the American Dream. The Real Griselda: A Notorious Life Griselda Blanco Restrepo, born in 1943 Colombia, led a life steeped in violence and crime. From a young age, she navigated the harsh realities of Medellín, a city deeply entrenched in the drug trade. Early reports allege she committed her first murder at 11, showcasing a chilling ruthlessness that would become her calling card. Blanco married multiple times, establishing connections and amassing wealth through each union. In her 20s, she immigrated to New York City, establishing a cocaine smuggling operation that e
Read more

BEST MOBILE PHONE 2023

Image
BEST CELL PHONE 2023 this year has finally shaken up the smartphone markets we've had new contenders phones that have vastly improved as well as past Giants who've just fallen off the radar so because it's been such a big one I have custom designed 10 different trophies to award to the winners of our 10 different categories all leading up to  the single best smartphone in the market right now and the winner of this giant thing so let's start with the most improved award which company has made the biggest jump from their last phone and it has to be Google look at this Beast of a trophy I'm so proud of this when their pixel 6 launched last year it gave us this 
Read more