Fractions, decimals and percentages are all ways of expressing numbers.
Each can be converted from one to another.
Below are some of the commonly used percentages, decimals and fractions.
Percentages 
5%

10%

15%

20%

25%

30%

40%

50%

Fractions 
^{1}⁄_{20}

^{1}⁄_{10}

^{3}⁄_{20}

^{1}⁄_{5}

^{1}⁄_{4}

^{3}⁄_{10}

^{2}⁄_{5}

^{1}⁄_{2}

Decimals 
0.05

0.1

0.15

0.2

0.25

0.3

0.4

0.5

Percentages 
60%

70%

75%

80%

90%

100%

Fractions 
^{3}⁄_{5}

^{7}⁄_{10}

^{3}⁄_{4}

^{4}⁄_{5}

^{9}⁄_{10}

1

Decimals 
0.6

0.7

0.75

0.8

0.9

1.0

Summary
>>Fractions Decimals Percentages Fractions Divide numerator by denominator Multiply by 100 Decimals Put over 10, 100 or 1000... Multiply by 100 Percentages Divide by 100 Divide by 100