64 times (640 ÷ 10 = 64).
30 times with a remainder of 10
70 times :)
640 ÷ 8 = 80.
640/4 = 160
640 ÷ 8 = 80
640 ÷ 16 = 40
71.1111 times.
7 times with a remainder of 38
71 times with a remainder of 1
8.53... the 3 repeating at the ...
8 with remainder 8.