Page 132 - Maths Skill - 3

130 Maths

2. Arrange in columns and add.

(a) 107 m 65 cm and 80 m 45 cm (b) 24 km 350 m and 9 km 175 m
(c) 54 km 74 m and 136 km 299 m (d) 18 km 900 m and 43 km 777 m

3. Subtract the following.

(a) m cm (b) m cm (c) m cm
3 5 2 3 8 0 8 4 9 9 9 0
– 1 6 2 0 – 6 3 1 2 – 1 9 8 4

(d) km m (e) km m (f) km m
6 4 8 5 0 1 1 2 8 1 5 9 0 0 5 5
– 4 3 2 8 5 – 7 4 1 7 2 – 3 7 1 4 8

4. Arrange in columns and subtract.
(a) 16 m 14 cm from 23 m 9 cm (c) 80 km 577 m from 83 km 275 m

(b) 73 km 190 m from 107 km 623 m (d) 46 m 5 cm from 78 m 19 cm

Word Problems

Let us learn how to solve word problems based on lengths with different units.

Let’s Attempt

Example 1: From a roll of electric cable 80 m long, a piece of length m cm
37 m 15 cm is used. How much cable is left in the roll? 7 9 9 10

Solution: Total length of cable = 80 m 8 0 0 0
Length of cable used = 37 m 15 cm – 3 7 1 5

Remaining length = 80 m – 37 m 15 cm = 42 m 85 cm 4 2 8 5

Example 2: Priya bought two pieces of ribbon of red and yellow colour measuring 5 m
35 cm and 3 m 15 cm respectively. What length of ribbon did she purchase
altogether. m cm

Solution: Length of red ribbon = 5 m 35 cm 1

Length of yellow ribbon = 3 m 15 cm 5 3 5
Total Length = 5 m 35 cm + 3 m 15 cm + 3 1 5

Thus, the total length of ribbon is 8 m 50 cm. 8 5 0

Example 3: How much is 19 m 83 cm less than 50 m? m cm
9
9
Solution: The required difference = 50 m – 19 m 83 cm 4 0 0 10
0
5
Thus, 19 m 83 cm is 30 m 17 cm less than 50 m. – 1 9 8 3
3 0 1 7