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Whole Numbers

Problems

Divisibility Rules

Factors, Primes, and Composites

Problem : Is 70,724 divisible by 2? By 4? By 8?

Yes, yes, no.

Problem : Is 82,791 divisible by 3? By 6? By 9?

Yes, no, yes.

Problem : Is 70,200 divisible by 5? By 10?

Yes, yes.

Problem : Think of a number that is divisible by 5 but not by 10.

Any number that ends in "5" is correct.

Problem : Is it possible to make a number that is divisible by 3 out of the digits 8, 1, 4, 7, 0, and 1? Is it possible to make a number that is divisible by 3 out of the digits 7, 4, 0, and 9?

Yes, no.

Problem : a) Make a number that is divisible by 2 out of the digits 6, 2, and 7.
b) Make a number that is divisible by 4 out of the digits 6, 2, and 7.

a) 762, 726, 672, or 276.
b) 672 or 276.

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