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iGCSE (2021 Edition)

1.02 Rounding

Worksheet
Natural and real numbers
1

State whether the following numbers are natural numbers, real numbers, both or neither:

a
12
b
0
c
-89
d
\sqrt{8}
e
2368
f
\sqrt{-5}
g
-\dfrac{6}{7}
h
\sqrt{81}
2

State whether the following numbers are natural numbers, real numbers, both or neither. Explain your answers.

a
94
b
-0.5
c
2\dfrac{5}{11}
d
\sqrt{-6}
Round whole numbers
3

Round the following numbers plotted on the number line to the nearest 100:

a
100110120130140150160170180190200
b
300310320330340350360370380390400
c
300310320330340350360370380390400
4

Round the following numbers to the nearest 10:

a

85

b

81

c

174

d

2076

e

1152

f

7

g

11\,207

h

106

i

47\,523

j

936

k

725\,817

l

5099

5

Round the following numbers to the nearest 100:

a

642

b

791

c

250

d

1181

e
4370
f

15\,575

g

65

h
25
i
968
j
2968
k
37\,920
l
4001
6

Round the following numbers to the nearest thousand:

a

3322

b

31\,835

c

96\,501

d

4214

e

7521

f

16\,600

g

17\,500

h

6\,400

i

11\,100

j

50\,025

k

550\,475

l

813\,244

7

Round 9\,264\,444 to the nearest million.

8

Three numbers have been rounded as follows:

  • 2400 was rounded to 2400
  • 3640 was rounded to 3600
  • 3546 was rounded to 3500

Were the numbers rounded to the nearest ten, hundred or thousand?

9

Write three different numbers that round to 80 when rounded to the nearest ten.

10

Write three different numbers that round to 400 when rounded to the nearest hundred.

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Outcomes

0580C1.1A

Identify and use natural numbers and real numbers.

0580E1.1A

Identify and use natural numbers and real numbers.

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