An estimate for -72 would be -70. When estimating a number, you round it to the nearest ten, hundred, thousand, etc. In this case, -72 is closest to -70 when rounded to the nearest ten.
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It depends on what you want to do with it. If you want to divide by 8, I would stick with 72. If you want to divide by 5, I'd go for 70 or even 72.5
64 = 8 x 8 81 = 9 x 9 so around 8.5
495.5
12.311
71 + 847 = 918 165 + 72 = 237 192 + 192 = 384
3/8 = 3 divided by 8. That equals 0.375. Times this number (0.375) X 72 will equal 27. If you look at 3/8, this is less than 4/8 (or 1/2). So you can estimate that the number will be less than 1/2 of 72 which is 36.