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Some other units of Length

In our daily life, we use several other units to measure length. The commonly used units
for measuring height and distance include inches, feet, yards and miles.

Conversion: 1 inch = 2 cm 5 mm

1 foot = 12 inches

1 yard = 3 feet

1 mile = 1 km 600 m

Example 4. Convert:
a. 3 inches into mm b. 12 feet into inches

c. 5 feet 7 inches into inches d. 3 feet into cm
Solution. a. 3 inches = 3 × (2 cm 5 mm) = 6 cm 15 mm

= 6 × 10 mm + 15 mm
= 60 mm + 15 mm = 75 mm

b. 12 feet = 12 × 12 inches = 144 inches

c. 5 feet 7 inches = 5 × 12 inches + 7 inches
= 60 inches + 7 inches = 67 inches

d. 3 feet = 3 × 12 inches = 36 inches
= 36 × (2 cm 5 mm) = 72 cm 180 mm = 72 cm + 18 cm = 90 cm

Exercise 7A

1. Identify the appropriate units for measuring each of the following.

Measurement unit of measurement (km/m/cm)

a. Height of the India Gate monument 42

b. Length of a mobile phone 13

c. Length of an elephant’s trunk 2

d. Length of the Nile River 6650

e. Length of the Great Wall of China 21196

f. Length of a blue whale 30

g. Height of the Tehri Dam 261

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Measurement