Firstly: Use a calculator if you want.
To find 70% of 20, take 70 divided by 100, then multiply it by 20.
So.........
70 divided by 100 = 0.7
Then times 20, which becomes 14.
Ans: 14
:0 ITS MAGIC
To check, take 14 divided by 20, then times 100
14 divided by 20 = 0.7
0.7 x 100 = 70
TADAAHHHHHH IM SO SMART