31 is a Prime number only divisible by itself and one.
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31 is.
The only number that goes into 18 and 31 is 1.
31 ÷ 9 = 3 remainder 4
31 goes into 128 approximately 4.129032 times.
Well, honey, 31 goes into 71 two times with a remainder of 9. So, technically, 31 goes into 71 two times, but it doesn't fit perfectly, leaving a little extra 9 hanging out on the side. Math can be a real party pooper sometimes, can't it?