Mathematics for IGCSE & O level - Limits Of Accuracy (Section 3 - No. 28)

Find the upper bound of the sum of 28.7 seconds and 31.4 seconds, both to 3 significant figures.

60.1 s

60.15 s

60.2 s

60.25 s

Upper bound of 28.7 is 28.75 s; Upper bound of 31.4 is 31.45. 28.75 + 31.45 = 60.2 s