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Need a Hint?

HINT: If a number is divisible by 15, it must be divisible by both 3 and 5.

See Answer

ANSWER: 1,110.

EXPLANATION: Because the number is divisible by 15, it must also be divisible by 3 and 5 (since 15 is divisible by 3 and 5). If the sum of the digits of a number is divisible by 3, then the number itself is divisible by 3 (this is a clever little math trick/shortcut). The number therefore must contain three ones, six ones, etc. Since the number is divisible by 5, we know that it must end in a 0 (numbers that are divisible by 5 end in a 0 or a 5). The first number that contains three ones and ends in a 0 is 1,110.

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