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anonymous

  • one year ago

Lilly told Abby that 87 was a composite number. Was she right? please explain why Help!

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  1. cooltowl
    • one year ago
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    This link will help http://www.mathsisfun.com/definitions/composite-number.html

  2. cooltowl
    • one year ago
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    And A composite number is a positive integer that has at least one positive divisor other than one or the number itself. So 87 is a composite number.

  3. zepdrix
    • one year ago
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    There are some cool tricks for checking divisibility :) If the number is even, then it's divisible by 2. If the sum of the digits add up to a multiple of 3, then it's divisible by 3. Example: 72. 7+2 = 9, which is a multiple of 3. So 72 is a composite of 3 and some other factor. For 4, you look at the last two digits I think... Some other cool tricks too :d

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