Worksheet on Length for Class 3

Solved Questions on Length

1. Convert 12 metres to millimetres.

a) 120 mm
b) 1200 mm
c) 12000 mm
d) 120000 mm

Answer: c) 12000 mm

Explanation: The conversion of 12 metres to millimetres is:
12 m = 12 × 1000
= 12000 mm

2. The height of the kid is 2 m 30 cm. What is the height of the teacher if the height of the teacher is three times the height of the kid?

a) 6 m 60 cm
b) 6 m 90 cm
c) 9 m 60 cm
d) 9 m 90 cm

Answer: b) 6 m 90 cm

Explanation: Height of the kid = 2 m 30 cm

= 2 m + 30 cm
= (2 x 100) cm + 30 cm
= 200 cm + 30 cm
= 230 cm 

The height of the teacher is three times the height of the kid.

Height of the teacher = 3 x Height of the kid
= 3 x 230 cm = 690 cm
= 600 cm + 90 cm
= 6 m + 90 cm
= 6 m 90 cm

3. The shopkeeper had a roll of rope that was 567 metres long. He sold 132 metres to a customer. How much rope in centimetres is left in the roll?

a) 22500 cm
b) 23700 cm
c) 34500 cm
d) 43500 cm

Answer: d) 43500 cm

Explanation: Total length of rope in a roll = 567 m
Length of rope sold to a customer = 132 m
Length of rope which is left in the roll = 567 − 132 = 435 m
Length of rope which is left in the roll = 435 x 100 = 43500 cm

4. If a bus travelled a distance of 72 kilometres while going to the Picnic on Sunday, What is the distance covered in metres?

a) 720 m
b) 7200 m
c) 72000 m
d) 720000 m

Answer: c) 72000 m

Explanation: Distance covered = 72 km
Distance covered in metres = 72 x 1000
= 72000 m

5. What is the sum of the heights of the two buildings in inches if the heights of the buildings are 9 feet and 6 feet, respectively?

a) 120 inches
b) 140 inches
c) 160 inches
d) 180 inches

Answer: d) 180 inches

Explanation: The height of the two buildings in feet = 9 + 6 = 15 feet
The height of the two buildings in feet = 15 x 12 inches
= 180 inches