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Ways to Check for Divisibility
Divisibility Rules Sound=20century Ways to Check for Divisibility
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All numbers are divisible by 1
Dividing By 1 All numbers are divisible by 1 All 2 easy
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Are these numbers divisible by 1?
Now You Try Are these numbers divisible by 1? 578 398 48 1903 490
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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
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Are these numbers divisible by 2?
Now You Try Are these numbers divisible by 2? 458 1279 759 555 1050
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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
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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?
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Are these numbers divisible by 3?
Now You Try Are these numbers divisible by 3? 639 56 86 360 468
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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
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Are these numbers divisible by 4?
Now You Try Are these numbers divisible by 4? 584 261 56 920 767
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Dividing by 5 If the number ends in 5 or 0 Great balls of fire
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Are these numbers divisible by 5?
Now You Try Are these numbers divisible by 5? 554 6890 345 902 845
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Dividing by 6 If the number is divisible by 2, and . . .
nice
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Are these numbers divisible by 6?
Now You Try Are these numbers divisible by 6? 897 258 630 345 84
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Dividing by 7
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Are these numbers divisible by 7?
Now You Try Are these numbers divisible by 7? 578 398 48 1903 490
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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?
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Are these numbers divisible by 8?
Now You Try Are these numbers divisible by 8? 568 396 48 1903 490
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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
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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?
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Are these numbers divisible by 9?
Now You Try Are these numbers divisible by 9? 578 398 48 1903 490
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If the number ends with a 0
Dividing by 10 If the number ends with a 0 All 2 easy
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Are these numbers divisible by 10?
Now You Try Are these numbers divisible by 10? 578 398 48 1903 490
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Dividing by 11
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Are these numbers divisible by 11?
Now You Try Are these numbers divisible by 11? 578 398 48 1903 490
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REVIEW Divisible by 1 Divisible by 2 Divisible by 3 Divisible by 4
Is this the end
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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
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That's all Folks! That’s all folks
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