Mathematics for IGCSE & O level - Limits Of Accuracy (Section 2 - No. 1)
Find the upper and lower bounds of the floor area of a rectangular room, which is 7.6m by 5.2m to the nearest 10cm. What is the upper bound of the area?
39.69 m²
39.7 m²
39.70 m²
40 m²
Explanation
Upper bound of 7.6 is 7.65, upper bound of 5.2 is 5.25, so upper bound of the area = 7.65 x 5.25 = 40.1625m², which is 40m² to 2 sig figs.
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