Chapter 7 Decimals Worksheet - New Century Maths Page 3
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38Start up
1 Arrange the numbers in each of these sets in ascending order:
Worksheet
a 21, 32, 34, 17, 8
b 23, 26, 54, 66, 33
7-01
c 101, 100, 110, 99, 102, 111
d 251, 247, 256, 254, 244
Brainstarters 7
2 Arrange the numbers in each of these sets in descending order:
a 44, 39, 42, 45, 38, 40
b 55, 56, 53, 50, 49, 52
c 1001, 1000, 1100, 1010, 1111
d 301, 310, 299, 318, 295
3 a Write 27 to the nearest ten.
b Write 752 to the nearest hundred.
Skillsheet
c Write 9079 to the nearest thousand.
d Write 16 837 to the nearest thousand.
7-01
e Write 29 537 to the nearest hundred.
f Write 40 219 to the nearest ten.
Rounding
whole numbers
4 Evaluate:
a 123 + 32 + 456
b 432 + 45 + 2341 + 7
c 6 + 78 + 32 + 9 + 199
d 47 852 + 365 + 1458 + 81
e 234 − 45
f 1138 − 445
g 894 − 35
h 114 782 − 36 989
58 × 3
j 126 × 8
i
k 589 × 13
789 × 26
l
m 2920 ÷ 8
n 2163 ÷ 7
o 10 836 ÷ 21
p 625 ÷ 25
5 Evaluate:
a 32 × 10
b 578 × 100
c 325 × 1000
d 400 × 10
e 400 ÷ 10
f 1200 ÷ 100
g 1 000 000 ÷ 1000
h 81 000 ÷ 100
Place value
You are familiar with numbers that have decimal points, for example:
Skillsheet
• money
$3.52
7-02
• measurements
6.2 m.
Decimal
The digits after the decimal point indicate a part of a whole.
fractions
The position of a digit in a number shows its size. This is known as place value.
Example 1
What does the number 532.81 mean?
Solution
5
3
2
.
8
1
hundreds
tens
units
tenths hundredths
decimal
point
So 532.81 is 5 × 100 + 3 × 10 + 2 × 1 + 8 ×
1
+ 1 ×
1
.
----- -
-------- -
10
100
200
NEW CENTURY MATHS 7
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