Well, you first have to figure out which number is bigger. 9 is bigger than 7, so it doesn't go in... but if you divide 7 by nine, it can go in part way (.7777777 (repeating) times).
It depends on whether you are talking about going in with no remainder or going in at all. For instance, 2 goes into 4 2 times evenly, but 3 goes into 4 once, but it doesn't match up exactly. Then, if you want to put bigger numbers into littler numbers, then you can only put part of them in.
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