You don't need to estimate, it equals 18
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7/9 of 225 is 175.
Divide 7 into 291. If it comes out evenly, it's a factor. It doesn't, so it's not.
28 in this case.
Because 25 is the largest number that will divide into both 25 and 75 evenly.
5, 11, 25, 55.