Making Percentages.

1
Making Percentages.
So 76 of pupils love maths .
Dream on !!
2
Testing Times.
John achieves the following grades in his exams
Write down in order what you think is Johns best
to work subject.
The problem is because the totals are all out of
different amounts we cant compare the subjects
very easily.
What can we do ?
Turn all the grades into a percentage out of a
hundred.
3
Marks As Percentages.
Look at the grades again
To change the maths score into a percentage we
multiply by
27 x 100
2700
67.5
x



40
40 x 1
We now know John gained 67.5 for maths.
Now turn the other scores into percentages.
4
Maths 67.5
English 72.3
Science 62.7
History 65.5
Now put the subjects in order from best to worst
English Maths History Science.
By turning different scores into percentages
which are always out of a hundred we can compare
the scores together accurately.
5
Further Problems.
Solve the problems below
(1) Express 34 as a percentage of 96
Solution
35.4


x
(2) 67 out of 89 people are men. What percentage
are men?
Solution
75.3


x
6
What Goes In The Box ?
(1) Express 67 out of 134 as a percentage.
50
(2) If 34 out of 66 people buy a newspaper , what
percentage is this ?
51.5
(3) If 34 out of 189 adults cant swim what
percentage can swim ?
82