Changing fractions to percentages

To change a fraction to a percentage you start off with a fraction and you want to write it as a percentage.
A percentage means how many out of a hundred.
So as a percentage is a , half, of the hundred.
       of 100 = 50
so = 50%  (remember to add the % sign)

The same for
as a percentage is a , quarter, of a hundred
      of 100 = 25
so = 25%  (again, remember the % sign)

For more difficult fractions you can work it out using a sum. For example:
as a percentage is of a hundred
x 100 = (3 ÷ 4) x 100
               = (0.75) x 100
               = 75
so = 75%   

Here are some more done as sums:

x 100  =  (1 ÷ 5) x 100  =  (0.2) x 100  =  20  so  = 20%

x 100  =  (1 ÷ 3) x 100  =  (0.333) x 100  =  33.3  so = 33% to the nearest percentage

x 100  =  (2 ÷ 3) x 100  =  (0.666) x 100  =  66.6 so = 67% to the nearest percentage

Another method is to use equivalent fractions. For example to find as a percentage write it as an equivalent fraction over 100:
=   which is like saying 50 out of 100, which is written as 50% using the percent sign.
Here are some more done using equivalent fractions:

      =      so = 25%
      =     so = 10%
      =     so = 90%
      =     so = 2%

Curriculum reference: N2/L1.3