Answers

2015-09-02T16:13:44+05:30
Reducing 4 to 2 by 4÷2 and 80=80×2=160 therefore 160 ×2 and reducing 2 to 1 by 2÷2 and 160 = 160×2=320 therefore 320× 1
0
2015-09-02T16:15:56+05:30
I am not sure but I think
40×8=80×4=160×2=320×1
0