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Tell whether each number is divisible by 2, 3, 4, 5, 8, 9, or 10. Some numbers may be divisible by more than one number. 1.324
2.840
3.2,724
4.81,816
5.7,848

  • new math -

    We'll be glad to check your answers.

  • new math -

    i think 840 is divisible by 10
    and 7,848 divisible by 2??

  • new math -

    What other numbers goes into 840 besides 10?

    Try them out.

    Yes, 7,848 is divisible by 2 --and four more numbers.

  • new math -

    840:5,2

  • new math -

    I sure hope that they still teach the following simple divisibility checks:
    - to be divisible by 2, the number must be even
    - to be divisible by 3, add up the digits of the number, if
    the sum is divisible by 3, so is the number
    - to be divisible by 4 , the last two digits must be 00 or the last two digits
    must be divisible by 4 , e.g. 840
    - to be divisible by 5, the number must end in either 0 or 5
    - to be divisible by 8 , the last 3 digits of the number must be divisible by 8
    - to be divisible by 9, add up the digits of the number, if
    the sum is divisible by 9 , so is the number
    - to be divisible by 10, the number must end in 0

    I will do the 2,724
    it is even, so divisible by 2
    sum is 2+7+2+4 = 15 , so divisible by 3
    last two digits are divisible by 4 , so divisible by 4
    does not end in 0 or 5, so NOT divisible by 5
    last 3 digits Not divisible by 8 , so NOT divisible by 8
    last digit is not 0 , so NOT divisible by 10

    repeat for the other numbers, you could always check with your calculator.

  • new math -

    7,848:8

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