Example:

A piece of A4 paper is 11.3 inches by 15.7 inches.

What are the lower and upper bounds of its area, in square inches, correct to 1 dp?

Halve one decimal place is 0.05 inches

To find the lower bound for the area multiply the lower bounds together

**i.e.** 11.25 × 15.65 **=** **176.1 inches ^{2} (1 d.p.)**

To find the upper bound for the area multiply the upper bounds together

**i.e.** 11.35 × 15.75 **=** **178.7 inches ^{2} (1 d.p.)**

Your Turn:

Henry ran 100m in 12.6 sec. both correct to 1 dp.

Find the UB and LB for his speed.

Enter your answer here:

≤ Speed <