persen[tex] \frac{4}{5}[/tex] dan 0,4

4/5 = 4/5 × 100%= 80%
0,4=4/10×100%=40%

Diubah ke persen:

4/5 = (4 × 20) / (5 × 20)
4/5 = 80/100
4/5 = 80%

0,4 = 4/10
4/10 = (4 × 10) / (10 × 10)
4/10 = 40/100
4/10 = 40%