Page 115 - Mathematics Coursebook

11.1 Simple percentages

4 a Copy this rectangle.
Shade 30%.
b What percentage is un shaded?

5 Write each fraction as a percentage.
a 1 b 3 c 3 d 3 e 9 f 1 g 19
4 10 20 5 10 20 20
1
2
6 1 = 33 %. Use this fact to write as a percentage.
3 3 3
7 Match the percentages and the fractions where you can. What should go on the two blank cards?

3 1 4 7 3
10 8 5 20 5

60% 40% 35% 30% 12.5%

8 The label on a new bag of flour states ‘Contents
500 grams’. A cake recipe uses 150 g of flour.
a What fraction of a new bag is used?
b What percentage is that?
c What percentage is left?

9 Work out the numbers missing from
these percentages.

a 30 metres is % of 100 metres
b 30 metres is % of 200 metres
c 30 metres is % of 50 metres
10 10 people out of a group of 39 watched a movie. Which of these is closest to the percentage that
watched the movie? Give a reason for your answer.
5% 15% 25% 35% 45% 55%
11 Work out the numbers missing from these percentages.
a 600 m is % of one kilometre
b 80 cm is % of one metre
c 200 ml is % of half a litre

114 11 Percentages