Area of Trapezia
Upper and lower bounds
1. Give the upper and lower bounds of each measurement
(a) 24cm to the nearest cm
(b) 6.3cm to the nearest mm
(c) 1.20m to the nearest cm
(d) 450 to the nearest 10
(e) 120cm to the nearest 10cm
(f) 3.87s to the nearest 1/100 of a second
2. Write down the smallest and largest numbers which will round to 2000 if it is correct to:
(a) 1 significant figure
(b) 2 significant figures
(c) 4 significant figures
Answers
1. (a) 24.5cm, 23.5cm (b) 6.35cm, 6.25cm (c) 1.205m, 1.195m
(d) 455, 445 (e) 125cm, 115cm (f) 3.875s, 3.865s
2. (a) 1500, 2500 (b) 1950, 2050 (c) 1999.5, 2000.5