Ways to Check for Divisibility

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Presentation transcript:

Ways to Check for Divisibility Divisibility Rules Sound=20century Ways to Check for Divisibility

Objective I will learn divisibility rules in order to help me find factors of whole numbers.

All numbers are divisible by 1 Dividing By 1 All numbers are divisible by 1 All 2 easy

Are these numbers divisible by 1? Now You Try Are these numbers divisible by 1? 578 398 48 1903 490

Dividing by 2 All even numbers are divisible by 2 Even numbers are numbers that end with either 2, 4, 6, 8, or 0 groovy

Are these numbers divisible by 2? Now You Try Are these numbers divisible by 2? 458 1279 759 555 1050

Dividing by 3 Add up the digits of the number If that number is divisible by 3, then the original number is If your sum is still a big number, continue to add the digits Nice

Dividing by 3 3 7 8 For example, take the number Add up the digits of the number 18 7 + 3 + 8 = If that number is divisible by 3, then the original number is Is 18 divisible by 3? Oh yeah! If your sum is still a big number, continue to add the digits 1 + 8 = 9 Is 9 divisible by 3?

Are these numbers divisible by 3? Now You Try Are these numbers divisible by 3? 639 56 86 360 468

If the last 2 digits together are divisible by 4 Dividing by 4 If the last 2 digits together are divisible by 4 Great scott

Are these numbers divisible by 4? Now You Try Are these numbers divisible by 4? 584 261 56 920 767

Dividing by 5 If the number ends in 5 or 0 Great balls of fire

Are these numbers divisible by 5? Now You Try Are these numbers divisible by 5? 554 6890 345 902 845

Dividing by 6 If the number is divisible by 2, and . . . nice

Are these numbers divisible by 6? Now You Try Are these numbers divisible by 6? 897 258 630 345 84

Dividing by 7

Are these numbers divisible by 7? Now You Try Are these numbers divisible by 7? 578 398 48 1903 490

Dividing by 8 If the last three digits are divisible by 8 If the number is divisible by 2, then by 2 again, and then by 2 again Sound=impressive So what type of number does it have to be?

Are these numbers divisible by 8? Now You Try Are these numbers divisible by 8? 568 396 48 1903 490

If that number is divisible by 9 then your number is divisible by 9 Dividing by 9 Similar to dividing by 3 Add up digits If that number is divisible by 9 then your number is divisible by 9

Dividing by 9 For example, take the number 924,561 Add up the digits of the number 27 9 + 2 + 4 + 5 + 6 + 1 = If that number is divisible by 3, then the original number is Is 27 divisible by 9? Oh yeah! If your sum is still a big number, continue to add the digits 2 + 7 = 9 Is 9 divisible by 9?

Are these numbers divisible by 9? Now You Try Are these numbers divisible by 9? 578 398 48 1903 490

If the number ends with a 0 Dividing by 10 If the number ends with a 0 All 2 easy

Are these numbers divisible by 10? Now You Try Are these numbers divisible by 10? 578 398 48 1903 490

Dividing by 11

Are these numbers divisible by 11? Now You Try Are these numbers divisible by 11? 578 398 48 1903 490

REVIEW Divisible by 1 Divisible by 2 Divisible by 3 Divisible by 4 Is this the end

Assignment Tell what each number is divisible by, either 2, 3, 4, 5, 6, 7, 8, 9, 10, or 11 186 85 69 298 747 952 3650 2738 1132 5084 3870 7896 69095 4892 3487 I like it, I love it, I want some more of it

That's all Folks! That’s all folks