There's only one number that equals 640.
The number is . . . . . 640.
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Twenty times thirty-two equals 640.
640 = acres in a square mile.
640
4600
You can fit 8 79s in 640. To figure this out, divide 640 by 79. 640 divided by 79 equals 8.08, so 8 79s will fit in 640.