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Published byRobert Rodgers Modified over 4 years ago

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Divisibility Rules Making friends with fractions

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The rule for 2 2 goes into every even number….. Even numbers are numbers that end in 0, 2, 4, 6, or 8

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The rule for 3 3 will go into a number if 3 goes into the sum of the digits Example: 1,266 The sum of the digits is 1 + 2 + 6 + 6 = 15 3 goes into 15….so 3 goes into 1,266

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The rule for 4 If 4 goes into the last two digits it goes into the number Example: 240…..4 goes into 40 so 4 goes into 240

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The rule for 5 5 goes into any number that ends in 0 or 5

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The rule for 6 If 2 and 3 go into a number, so does 6 Example: 132….2 goes into it because it is even….3 goes into it because the sum of the digits is 6….6 goes into it because 2 and 3 do

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The rule for 7 Take the last digit and double it….subtract that from the remaining digits…continue until you get a number that is divisible by 7 Example: 133…take the last digit and double it…..3 x 2 = 6 13 – 6 = 7….7 goes into 7 so 7 goes into 133.

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The rule for 8 Not on our list, because its a rotten rule! If 8 goes into the last 3 digits, it goes into the number.

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The rule for 9 Same as the rule for 3…..if 9 goes into the sum of the digits it goes into the number. Example: 1,233….the sum of the digits is 9…9 goes into 9 so 9 goes into 1,233

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The rule for 10 10 goes into any number that ends in 0

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What will divide evenly into: 222 224 1,200 7,011 156 440 812

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4.1 Divisibility and Mental Math. Mental Math Is 56 divisible by 7? Think! 56 = 8 x 7 Is 56 divisible by 4? Think! 56 = 8 x 7, and 4 x 2 = 8, 56 is divisible.

4.1 Divisibility and Mental Math. Mental Math Is 56 divisible by 7? Think! 56 = 8 x 7 Is 56 divisible by 4? Think! 56 = 8 x 7, and 4 x 2 = 8, 56 is divisible.

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