Billy found it easy to divide 9, because 9 was a what of 3?\nOptions:\n- multiply\n- multiple\n- unite\n- multiplication\n- multiple
Let's think step by step.
multiple
Multiple is a number that may be divided by another a certain number of times without a remainder.

Billy found it easy to divide 9, because 9 was a multiple of 3.

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Thus, the answer is multiple