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

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cooltowl
 one year ago
Best ResponseYou've already chosen the best response.0This link will help http://www.mathsisfun.com/definitions/compositenumber.html

cooltowl
 one year ago
Best ResponseYou've already chosen the best response.0And 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.

zepdrix
 one year ago
Best ResponseYou've already chosen the best response.1There 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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