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JAMB Mathematics 2020 Paper

Question : 5

Total: 40

\frac{0.02174 \times 1.2047}{0.023789}

Solution:

Concept:

Round every number to two significant figures, then substitute the rounded values into the expression and simplify.

Explanation:

Round each value to two significant figures.

0.02174 \approx 0.022

1.2047 \approx 1.2

0.023789 \approx 0.024

Substitute into the expression.

\frac{0.02174 \times 1.2047}{0.023789} \approx \frac{0.022 \times 1.2}{0.024}

Multiply the numerator.

0.022 \times 1.2 = 0.0264

Divide by the denominator.

\frac{0.0264}{0.024} = 1.1

Answer:

1.1, which is option C.

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