Fractions to Decimals to percentage converting.

1/5 = 0.2     e.g. 3/5 = 0.6

1/4 = 0.25   e.g. 2/4 = 0.5

1/10 = 0.1   e.g. 8/10 = 0.8

if you squished the numerator and denominator, a fraciton would look like this ÷ .

This means that a fraction is a division sum. 4/5 = 4 ÷ 5.

So to change a fraction to a decimal all you need to do is divide the two numbers. 
4 ÷ 5 = 0.8

3 ÷ 5 = 0.6,  2 ÷ 4 = 0.5, 8 ÷ 10 = 0.8.

fraction to decimal - Top ÷ Bottom.                 e.g. 4/5 = 4 ÷ 5 = 0.8.

Decimal to percentage - X by 100.                  e.g. 0.8 X 100 = 80%.

Percentage to fraction - Put it over 100.          e.g. 80% = 80/100 = 4/5.