Chapter 7 Decimals Worksheet - New Century Maths Page 30
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382 Copy and complete the following pattern:
1
2
3
4
5
6
7
8
Fraction:
-- -
-- -
-- -
-- -
-- -
-- -
-- -
-- -
9
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9
9
Decimal:
0.
1
0.
2
3 Perform these calculations and write the answers as recurring decimals:
a 11 ÷ 3
b 11.3 ÷ 7
c 58.43 ÷ 9
d 1.9 ÷ 6
e 76 ÷ 9
f 0.67 ÷ 6
g 2 ÷ 7
h 13.4 ÷ 6
149 ÷ 7
i
j 13 ÷ 3
k 196 ÷ 11
12 ÷ 7
l
m 7 ÷ 11
n 17 ÷ 12
o 18.1 ÷ 9
Rounding decimals
Skillsheet
Sometimes, to approximate an answer with many decimal places, we round to fewer
7-01
decimal places. We need to be able to round when working with money, measuring
Rounding
quantities or writing answers to division calculations.
whole numbers
To round a decimal:
• cut the number at the required decimal place
• look at the digit immediately to the right of the specified place
• if this digit is 0, 1, 2, 3 or 4, leave the number in the specified place unchanged
• if the digit is 5, 6, 7, 8 or 9, add 1 to the number in the specified place.
Example 20
1 Round 86.246 correct to one decimal place.
Solution
86.2 46
cut
the next digit is 4, so the number 2 does not change
So 86.245 is 86.2 (correct to one decimal place).
2 Round 86.246 correct to two decimal places.
Solution
86.24 6
cut
the next digit is 6, so add 1 to 4 to give 5
So 86.246 is 86.25 (correct to two decimal places).
Example 21
The number 0.087 1245 has seven decimal places. Round it to:
a one decimal place
b two decimal places
c the nearest thousandth
Solution
a 0.1
b 0.09
c 0.087
227
DECIMALS
CHAPTER 7
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