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Mathematics Questions and Answers

How good are you with figures and formulas? Find out with these Mathematics past questions and answers. This Test is useful for both job aptitude test candidates and students preparing for JAMB, WAEC, NECO or Post UTME.

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2,281.

express 62 $\div$ 3 as a decimal correct to 3 significant figures

20.6

20.667

20.67

20.7

View answer & explanation

Correct answer is D

$\frac{62}{3}$ = 20.6666.....

= 20.7 to 3 sig. fig.

2,282.

Find correct to 3 decimal places ( $\frac{1}{0.05}$ + $\frac{1}{5.005}$ ) - (0.05 x 2.05)

99.998

98.999

89.899

9.998

View answer & explanation

Correct answer is A

( $\frac{1}{0.05}$ + $\frac{1}{5.005}$ ) - (0.05 x 2.05)

( $\frac{1}{0.05}$ x 5.005) - (0.05 x 2.05)

$\frac{5.005}{0.05}$ - 0.1025

100.1 - 0.1025

= 99.9975

99.998 to 3 decimal place.

2,283.

If 2257 is the result of subtracting 4577 from 7056 in base n, find n

View answer & explanation

Correct answer is A

$\begin{array}{c|c} 7056 \\ \text{- 4577} \\\hline 2257 \end{array}$
By trial and error method

Let the base to 8

i.e. Let n = 8 and it is easily verified that the subtraction holds.

The subtraction does not hold when other values of n are tried

n = 8

2,284.

Simplify 3 $\frac{1}{3}$ - 1 $\frac{1}{4}$ x $\frac{2}{3}$ + 1 $\frac{2}{5}$

View answer & explanation

Correct answer is C

3 - $\frac{1}{3}$ - ( $\frac{5}{4}$ x $\frac{2}{3}$ ) + 1 $\frac{2}{5}$

= $\frac{10}{3}$ - $\frac{5}{6}$ + $\frac{7}{5}$

= $\frac{100 - 25 + 42}{30}$

= $\frac{117}{30}$

= 3.9

$\approx$ 4