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Divisibility Rules How do we know when we can divide one number into another exactly? Jenny Russell Source: http://www.primaryresources.co.uk/online/powerpoint/Divisibility%20Rules.ppt

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Divisibility Rules (2) 4 A number can be divided by 2 if 4 the last digit is even

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Divisibility Rules (3) 4 a number is divisible by 3 if 4 the sum of the digits is 3, 6 or 9

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Divisibility Rules (4) 4 a number is divisible by 4 if 4 the number made by the last two digits can be divided by 4

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Divisibility Rules (5) 4 A number is divisible by 5 if 4 the last digit is a 5 or a 0

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Divisibility Rules (6) 4 A number can be divided by 6 if 4 the last digit is even and the sum of all the digits is 3, 6 or 9

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Divisibility Rules (8) 4 A number is divisible by 8 if 4 the number made by the last three digits will be divisible by 8

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Divisibility Rules (9) 4 A number is divisible by 9 if 4 the sum of all the digits will add to 9

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Divisibility Rules (10) 4 A number can be divided by 10 if 4 the last digit is a 0

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Divisibility Rules 4 A number can be divided by 7 if 4 ……………… can you find a rule?

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Divisibility Rules 4 2, the last digit will be an even number 4 3, all the digits will add to 3,6 or 9 4 4, the number made by the last two digits can be divided by 4 4 5, the last digit will be a 5 or 0

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Divisibility Rules 4 6, the last digit will be even and the digits will add to 3, 6 or 9 4 8, the number made by the last three digits will be divisible by 8

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Divisibility Rules 4 9, the sum of the digits will be 9 4 10, the last digit will be a 0 4 There is no easy test for 7, although some methods have been invented, however it is easier to use a pencil and paper method.

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Divisibility Rules 4 Apply these rules to these numbers: 4 74,673,042 4 444,555,448 4 61,616,168 4 732,510 4 66,666,666 4 179,131,590

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