640*4 = 2560
80 multiplied by 640 is 51,200
640 x 60 = 38400
101534080
640
22,400
40
16
You can do this problem by multiplying by the reciprocal aka 16/1so 640 *16 =640 * 16 = 10 240
640 ÷ 16 = 40
40 * 16 ------ +240 040 ----------- 640 the answer is 640
16 % of 4000 is 640 here how it is 16 % of 4000 =(16/100)*4000 =640