Cambridge IGCSE Mathematics Core and Extended CD-ROM
Answers to Extended revision exercises: Measurement
Worksheet 13: Understanding measurement
1 (a) 4500 (b) 970 (c) 970 (d) 2.324 65 (e) 80 (f) 0.059
(g) 5 800 (h) 26 670 (i) 900 (j) 0.077 (k) 0.0125 (l) 3
2 (a) 9 km, 100 m (b) 69 015 cm, 15 cm (c) 285 mm, 2 mm (d) 4.99 m, 98 cm
(e) 0.7 km, 15 m (f) 5.5 km, 50 m
3 (a) 700 (b) 1200 (c) 6420 (d) 70 000 (e) 0.009 543 (f) 4 423 000
4 (a) 56 000 (b) 11 000 (c) 34 400 (d) 485 000 (e) 0.149 (f) 0.000 019 6
5 (a)
Day Time in Time out Lunch Hours worked
Monday 8.15 a.m. 5.25 p.m. 45 mins 8 hours 25 mins
Tuesday 8.17 a.m. 5.30 p.m. 30 mins 8 hours 43 mins
Wednesday 8.23 a.m. 5.50 p.m. 45 mins 8 hours 42 mins
Thursday 8.22 a.m. 6.00 p.m. 60 mins 8 hours 38 mins
Friday 7.58 a.m. 7.00 p.m. 45 mins 10 hours 17 mins
(b) 44 hours 45 mins (c) $221.57 (d) $194.93
6 (a) 33.5, 34.5 (b) 12 877.5, 12 878.5 (c) 550, 650 (continuous data) or 649 (discrete data)
(d) 15.335, 15.345 (e) 12.685, 12.695 (f) 4.25, 4.75
(g) 665, 675 (continuous data) or 674 (discrete data)
(h) 3.1415, 3.1425
7 12.25 kg, 12.75 kg
8 (a)(i) 4462 (ii) 3493.5 (iii) 10 466.1 (iv) 38 544 (v) 5440.5 (vi) 14 977.6
(b) 3851.35
(c) 1502.79
Original material © Cambridge University Press 2015 1
Cambridge IGCSE Mathematics Core and Extended CD-ROM
9 (a) 0.2 m (b) 1 foot (c) 10 feet (d) 4.5 m (e) 1.8 m
10 Lower bound = 1.05 kg Could also be written as:
Upper bound = 1.35 kg 1.05 kg combined mass < 1.35 kg
11 Lower bound = 42.4 m Could also be written as:
Upper bound = 42.8 m 42.4 m width < 42.8 m
12 (a) 4106.363 abc < 5182.427
(b) – 2.205 (a – b) < – 2.095
(c) 3452.095 c – (a – b) < 3551.205
1
(d) 0.685 < 0.840
ab
a
(e) 0.169 < 0.208
b
c
(f) 1564.626 < 1694.033
ba
( a b)
(g) 1.166 < 1.212
b
13 4.7 cm x < 6.3 cm
Original material © Cambridge University Press 2015 2
