Which of these is not a rational number and why? [2 MARKS] 3 9 , − 4 11 , √ 2 , π Options:

Which of these is not a rational number and why? [2 MARKS]

Question

Which of these is not a rational number and why? [2 MARKS]
$\frac{3}{9}, \frac{- 4}{11}, \sqrt{2}, π$

Options:

Answer: Option A
:
Answer: 1 Mark
Reason: 1 Mark
A rational number is one which has an integer as its numerator and denominator but the denominator cannot be equal to zero. Hence, the rational numbers here are:

\frac{3}{9}, \frac{- 4}{11}

As the numbers

\sqrt{2}, π

cannot be written in simple fractions therefore thay are irrational ( Note:

π = \frac{22}{7}

is a popular approximation, but it is not accurate.)

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