Mathematics for IGCSE & O level - Limits Of Accuracy (Section 2 - No. 4)
A rectangle measures 12 cm by 5 cm, with both measurements correct to the nearest centimetre. What is the smallest possible area of the rectangle?
59 cm²
59.25 cm²
54.25 cm²
54 cm²
Explanation
The lower bound for 12 cm is 11.5 cm and for 5 cm is 4.5 cm. The smallest possible area is therefore 11.5 * 4.5 = 51.75cm²
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