Fractions Worksheet Page 26
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36Fractions
9 Arrange these in order of size starting with the smallest.
(a) 37% 0.68 0.27 (b) 42% 38% 0.45
(c) 80%
9
7
(d) 34%
38
13
10
10
100
50
(e)
6
0.25 23%
25
Changing a decimal into a fraction
To write a decimal as a fraction you need to look at the
place value of the last significant figure.
(a)
0
.
4
8
For significant figures see Section
(b)
0
.
2
2
5
2.1. For place value see Section 1.1.
(c)
0
.
0
3
7
(d)
.
2
1
9
In (a) the last significant figure is in the hundredths
column.
48
So 0.48 5
‘hundredths’
�4
100
have
48
12
denominator
�
48
12
100
25
simplifies to
100.
100
25
�4
In (b) the last significant figure is in the thousandths column.
So 0.225 5
225
‘thousandths’ have denominator
1000
1000.
�25
225
9
�
1000
40
�25
In (c) the last significant figure is in the thousandths
column.
37
So 0.037 5
37
cannot be simplified further.
1000
1000
(d) is a mixed number – it has a whole number part and a
fractional (decimal) part. The last significant figure of the
decimal part is in the hundredths column, so 2.19 5 2
19
.
100
Decimals such as 0.48, 0.225 and 0.037 are terminating
decimals. They end, or terminate, rather than going on
for ever.
Number 85
M03_CMC_SB_IGCSE_6850_U03.indd 85
9/6/09 16:45:20
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