Page 170 - Touchpad Mathematics_Ver1.0_C5

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Conversion from Bigger units to Smaller units

Example 2. Convert:
a. 3 km into m b. 7 m into cm c. 4 cm into mm

d. 2 km into dam e. 6 cm 9 mm into mm f. 8 m 23 cm into cm

Solution. a. 1 km = 1000 m

3 km = (3 × 1000) m = 3000 m

b. 1 m = 100 cm
7 m = (7 × 100) cm = 700 cm

c. 1 cm = 10 mm

4 cm = (4 × 10) mm = 40 mm

d. 1 km = 100 dam

2 km = (2 × 100) dam = 200 dam
e. 6 cm 9 mm = (6 × 10) mm + 9 mm = 60 mm + 9 mm = 69 mm

f. 8 m 23 cm = (8 × 100) cm + 23 cm = 800 cm + 23 cm = 823 cm

Conversion from Smaller units to Bigger units

Example 3. Convert:

a. 4000 m into km b. 200 cm into m

c. 40 mm into cm d. 60000 dm into km
e. 223 cm into m and cm f. 7232 m into km and m

Solution. a. 1000 m = 1 km

4000 m = (4000 ÷ 1000) km = 4 km

b. 100 cm = 1 m

200 cm = (200 ÷ 100) m = 2 m
c. 10 mm = 1 cm

40 mm = (40 ÷ 10) cm = 4 cm

d. 10000 dm = 1 km

60000 dm = (60000 ÷ 10000) km = 6 km

e. 223 cm = 200 cm + 23 cm = (200 ÷ 100) m + 23 cm = 2 m 23 cm
f. 7232 m = 7000 m + 232 m = (7000 ÷ 1000) km + 232 m

= 7 km 232 m

168 Mathematics 5