Calculators should not
be used anywhere in this
book unless you are
otherwise instructed.
Exercise 1.1
1.
Copy each number and round to the nearest 10 :–
a
2.
58 → .....
b
234 → .....
c
3456 → .....
c
9994.
Round each number to the nearest 10 :–
a
3.
Chapter 1
Rounding
96
b
995
Rudy counted 234 animals at the safari park.
Round this number to the nearest 10.
4.
Arthurlie Juniors had 2156 supporters at the cup final.
Round this number to the nearest 10.
Exercise 1.2
1.
Copy each number and round to the nearest 100 :–
a
2.
b
6549 → .....
c
8761 → .....
c
1864.
Round each number to the nearest 100 :–
a
3.
321 → .....
64
b
951
Amy has 1234 dolls in her collection.
Round this number to the nearest 100.
4.
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Mr. Jones travels a total of 1495 kilometres every
week in his van.
a
Round this number to the nearest 10.
b
Round this number to the nearest 100.
page 1
Rounding
Exercise 1.3
1.
Copy each number and round to the nearest 1000 :–
a
2.
b
7099 → .....
17 864
b
995
Shown are the flying distances
between London and other major
cities.
8550 → .....
c
9995.
Distances from London (in miles)
Rome
Calcutta
San Francisco
Sydney
Round each distance to the
nearest 1000 miles.
4.
c
Round each number to the nearest 1000 :–
a
3.
1499 → .....
887
4947
5357
10 564
A round trip from London to Shanghai would be 11 508 miles.
Round this number to the nearest :–
a
10
b
100
c
1000.
c
791 ÷ 18
Exercise 1.4
1.
Copy and complete to find an approximate answer to:–
a
2.
3.
57 x 39
b
419 x 32
≈ 60 x 40
≈ 400 x ...
≈ 800 ÷ ...
≈ .......00
≈ ..........
≈ ..........
Find an approximate answer to each calculation :–
a
19 x 29
b
394 x 95
c
8906 x 287
d
78 ÷ 23
e
196 ÷ 38
f
7777 ÷ 381.
Find an approximate answer to each of these question using 1 figure accuracy :–
a
A bicycle weighs 4935 g.
Find the weight of 31 bicycles.
b
A company wants to distribute 84 945 vouchers
to 4385 families.
How many vouchers will each family receive ?
©TeeJay Publishers 2007
page 2
Rounding
Exercise 1.5
1.
Copy each number and round to 1 decimal place :–
a
2.
b
70·49 → .....
c
1·95 → .....
c
180·1904.
c
2·8552 → .....
c
11·1991.
c
9755.
c
134 513.
Round each number to 1 decimal place :–
a
3.
16·86 → .....
9·647
b
99·561
Last week, 4·67 centimetres of rain fell in Motherwell.
Round this number to one decimal place.
Exercise 1.6
1.
Copy each number and round to 2 decimal places :–
a
2.
b
16·4921 → .....
Round each number to 2 decimal places :–
a
3.
4·627 → .....
3·777
b
10·84499
A book is 4·824 centimetres thick.
Round this number to two decimal places.
Revision Exercise
1.
Round each number to the nearest 10 :–
a
109
b
276
2.
Round each number in question 1 to the nearest 100.
3.
Round each number to the nearest 1000 :–
a
4.
4560
b
87 299
There were 69 794 spectators at the Champions League Cup Final.
Round this number to the nearest :–
a
5.
100
c
1000.
39 x 29
b
387 x 406
c
31 867 ÷ 289.
Round each number to the number of decimal places (d.p.), requested:–
a
.
b
Find an approximate answer to each calculation below :–
a
6.
10
13·621 (1 d.p)
©TeeJay Publishers 2007
b
19·634 (2 d.p.)
page 3
c
9·995 (2 d.p.)
Rounding