Writing One Number as a Percentage of Another


Out of a class of 30 children, 3 were absent on Friday. What percentage of the class was absent? We can write this as a fraction: 3


__ 30 or 1


ways.


Fraction method: 1.


__ 10 of 100% = 1


1 Decimal method:


__ 10 × 100


___ 1 = 100


___ 10 = 10%


2.


10 1.00 0.10 = 10%


1. Write the following as percentages. a) 4 out of 20 d) 48 out of 75 g) 63 out of 90 j) 35 out of 80


b) 50 out of 200 e) 120 out of 160 h) 77 out of 100 k) 52 out of 65


c) 18 out of 30 f) 210 out of 500 i) 5 out of 40


l) 150 out of 600 2. What percentage of each of these shapes are a) red b) blue c) yellow?


___ 30 × 100


3 1 10


___ 1 = 100


___ 10 = 10%


__ 10. We can then change this to a percentage in 2


3. Jill had 48 colouring pencils but lost 6 of them. What percentage of the pencils did she lose?


4. Kevin has to draw a line measuring 50cm, but as his ruler is only 30cm long he has only drawn 30cm so far. What percentage of the line has he drawn?


5. Melissa is running a long-distance race of 5km. She has run 1.5km already. a) What percentage of the race has she run? b) What percentage of the race does she have left to run?


Percentages 159


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