Page 281 - Math Smart - 7

100% 20 d) 100%-►285
20
1% Find 1% Find 1%
100
57 7
5% Multiply by 5 70% ^ Multiply by 70
^ 1
= 1 2
57 X 7
5% of 20 = 1 = 2
_ 399
2
= 199

70% of 285 = 199^

Method 2

3% of 200= ^ X 20& b) 24% of 400= ^ X4e0

1 1
= 3X2 = 24x4
= 6 = 96

7 57 The word 'of has
c) 5%of20=3|^x^ d) 70% of 285 = ^x 285 the same meaning
70
as multiply as seen
40^
in Method 2. The
- 5
~ 5 percentage is expressed
_ 7 X 57
= 1 2 as a fraction with a
_ 399 denominator of 100,
- 2 and multiplied by the
= 1991 whole number.

Example 2

We can also use a calculator to find the percentage of a number.

Find 35% of 1800.
Solution

On a calculator, enter the percentage Enter:
and multiply it by 1800. (T)|T|(s^|13@0]® BB(=]

The display gives the answer 630.

35% of 1800= :^x 1800

= 630