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Well, honey, you can fit 21 into 57 two times with a remainder of 15. So, technically, 21 goes into 57 two times, but you're left with a little extra that just can't be divided evenly. Math can be a real stickler like that.
To determine how many times 21 goes into 90, we need to perform integer division. When we divide 90 by 21, the result is 4 with a remainder of 6. Therefore, 21 goes into 90 four times evenly, with no remainder.