6. Pick 6 television programmes and ask 20 people in your class to pick their favourite. Fill in the information on a chart like this:
TV Programme Fraction
__ 20
__ 20
__ 20
7. a) If Jill used 45% of a bag of sugar to bake a cake, what percentage of the bag was left?
b) Grace got 98% on a spelling test. What percentage of the spellings did she get wrong?
c) Marcus used 30% of his petrol driving to Kerry. What percentage did he have left to get him home again?
Sometimes when changing a fraction or a decimal to a percentage, we don’t get a whole number as the percentage.
__ = ___ 8
1
– 2
– 8
121 100
= 0.125 = 121
– 2%
__ = ___ 3
1
– 3
b) 2
– 3
331 100
= 0.333 = 331
– 3%
8. Can you change the following fractions to decimals and then percentages? a) 3
c) 5
– 8
Ross is reading a book that has 60 pages. If he read 50% of the book in 1 week, how many pages did he read?
50% = 50 ___
– 2 of 60 = 60 ÷ 2 = 30
1 So Ross read 30 pages.
9. Try these. a) 50% of 160 pages = 1 b) 50% of 200 pages = c) 50% of 90 pages = d) 100% of 70 pages =
f) 25% of 36 pages =
– 2 of 160 =
pages pages pages
e) 25% of 80 pages = 25 ___
100 = 1
– 4 of 80 =
pages
We can now find 50% and 25% of a number by converting them to fractions and then finding that fraction of the number.
25% of 40 = 1
– 4 of 40 = 10
Percentages 167 pages pages 100 = 1
– 2
d) 7
– 8
Decimal %
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