There are: 640/9 = 71 with a remainder of 1
5
Nine of them
79
10 times
Eleven.
Exactly 6 of them
24 of them with a remainder of 2
The GCF of 9s and 63s^3 is 9s.
640 grams = 22.57ounces.
There are 640 acres in a section.
640 ounces = 40 pounds
640 acres = 27,878,400ft²