The number itself.
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They can go into 8*4*9 = 288. That is not the smallest such number, but that was not the question.
the answer is 72 because 1 *72=72 so therefore we say that 72 is a multiple of 72 as well as the smallest multiple
The smallest number which is a common multiple of both 7 and 4 is 28.
18
1764