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6 Cards in this Set
- Front
- Back
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Dividing by 3
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1. Add up all the digits in the number.
2. Find out what the sum is. If the sum is divisible by 3, so is the number 3. For example: 12123 (1+2+1+2+3=9) 9 is divisible by 3, therefore 12123 is too! |
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Dividing by 4
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1. Are the last two digits in your number divisible by 4?
2. If so, the number is too! 3. For example: 358912 ends in 12 which is divisible by 4, thus so is 358912. |
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Dividing by 6
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1. If the Number is divisible by 2 and 3 it is divisible by 6 also.
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Dividing by 7
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1. Is 203 is divisible by 7?
2. Double the last digit: 3 x 2 = 6 3. subtract that from the rest of the number: 20 - 6 = 14. 4. Check to see if the difference is divisible by 7: 14 is divisible by 7, therefore 203 is also divisible by 7. |
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Dividing by 8
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1. The last three digits form a number divisible by 8
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Dividing by 9
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1. Almost the same rule and dividing by 3. Add up all the digits in the number.
2. Find out what the sum is. If the sum is divisible by 9, so is the number. 3. For example: 43785 (4+3+7+8+5=27) 27 is divisible by 9, therefore 43785 is too! |
