Question

The sides of a rectangle are 6.3 cm and 4.8cm, each correct to 1 decimal place.

Calculate the upper bound for the area of the rectangle.

Answer 1

error= 0.1/2, 0.05

4.8 + 0.05 = 4.85

6.3 + 0.05 = 6.35

4.85 x 6.35 = 30.7975 cm (when rounded, gives 30.80 cm).

Explanation: