Well honey, if you do the math, 16 goes into 640 a grand total of 40 times. It's simple division, not rocket science. So, there you have it, 16 fits into 640 exactly 40 times.
70 times :)
64 times (640 ÷ 10 = 64).
640 ÷ 8 = 80.
640/4 = 160
640 ÷ 8 = 80
64 times.
71.1111 times.
7 times with a remainder of 38
30 times with a remainder of 10
71 times with a remainder of 1
8.53... the 3 repeating at the ...
2 goes into 32 ... 16 times