320.
80 x 4 = 320
320/80 = 4
320
320
It is 4 times 320 = 1280
343-23=320 320/4=80 or x4+23=343 x4+23-23=343-23 x4=320 x4/4=320/4 x=80
40 x 8
first 400 is 4 times of 100 . so 80 percent of 400 is 4 times 80 which is 320. This can be done if the number is multipliable by 10.
145 times 320 is 46,400
It is: 160 times 2 = 320
80