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Australia
Year 9

1.02 Rational and irrational numbers

Worksheet
Rational and irrational numbers
1

Classify the following numbers as rational or irrational:

a
4
b
-4
c
4.435
d
\dfrac{3}{13}
e
\dfrac{7}{6}
f
- 0.7
g
\pi
h
0
2

Is \sqrt{15} an integer?

3

Classify the following numbers as rational or irrational:

a

\sqrt{7}

b

\left(\sqrt{7}\right)^{2}

c

\sqrt{35}

d

\sqrt{81}

e
- \sqrt{13}
f
- \sqrt{64}
g

\sqrt{23}

h

\sqrt{64}

4

Simplify each of the following numbers and state whether they are rational or irrational:

a

\sqrt{16}

b

\dfrac{2\pi}{8}

c

-\dfrac{4\pi}{5\pi}

d

\dfrac{0.4}{5}

5

Akin states that 24.737337333... is a rational number because it has a repeating pattern.

Is Akin correct? Explain your answer.

Number lines
6

Plot the following numbers on the following number line:

-4-3-2-101234
a

-3

b

\pi

c

0.5

d

\sqrt{3}

e

\dfrac{4}{5}

f

-2.2

g

\sqrt{7}

h

-\dfrac{3}{2}

7

Plot the following sets of numbers on a number line:

a

2, \, \dfrac{5}{2}, \, \pi

b

-2, \, -\dfrac{1}{2}, \, \sqrt{3}

c

3, \, -2.3, \, \sqrt{5}

d

1.7, \, -1.1, \, \dfrac{7}{3}

8

Plot the following surds on a number line:

a
\sqrt{13}
b
\sqrt{43}
c
\sqrt{88}
d
\sqrt{110}
Estimating irrational numbers
9

State the integer that each of the following numbers is closest in value to:

a
\sqrt{52}
b
\sqrt{130}
c
\sqrt{67}
d
\sqrt{221}
10

Which one of the following has a value between 10 and 11?

A
\sqrt{143}
B
\sqrt{102}
C
\sqrt{90}
D
\sqrt{167}
11

Consider the number \sqrt{22}.

a

Complete the inequality with two consecutive perfect square numbers that 22 lies between:⬚ < 22 < ⬚

b

Complete the inequality with two consecutive integers that \sqrt{22} lies between:⬚ < \sqrt{22} < ⬚

12

Consider the number \sqrt{59}.

a

Complete the inequality with two consecutive perfect square numbers that 59 lies between:⬚ < 59 < ⬚

b

Complete the inequality with two consecutive integers that \sqrt{59} lies between:⬚ < \sqrt{59} < ⬚

13

Determine the two consecutive integers that will complete the following inequalities:

a
⬚ < \sqrt{8} < ⬚
b
⬚ < \sqrt{20} < ⬚
c
⬚ < \sqrt{98} < ⬚
d
⬚ < \sqrt{74} < ⬚
e
⬚ < \sqrt{38} < ⬚
f
⬚ < \sqrt{75} < ⬚
g
⬚ < \sqrt{50} < ⬚
h
⬚ < \sqrt{140} < ⬚
14

State the integer that lies between \sqrt{12} and \sqrt{22}.

15

For each of the following pairs of numbers, select the number with the larger value:

a

\sqrt{27} or \sqrt{22}

b

\sqrt{50} or \sqrt{46}

c

\sqrt{20} or 5

d

\sqrt{15} or 3

16

For each of the following pairs of numbers, select the number with the smaller value:

a

4 \pi or 12

b

\pi^2 or 144

c

\sqrt{120} or 11

d

\sqrt{72} or 8

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Outcomes

AC9M9N01

recognise that the real number system includes the rational numbers and the irrational numbers, and solve problems involving real numbers using digital tools

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