Page 141 - ICSE Math 4

Now subtract 98 cm from 162 cm.
162 cm – 98 cm = 64 cm. Write 64 under cen metres.

Step 3: Subtract the metres.

72 m – 45 m = 27 m. Write 27 under metres.

So, the diff erence between the given lengths is 27 m 64 cm.

Example 7: Two ropes of length 83 m 25 cm and 60 m 70 cm are joined together. Find the

total length of the joined rope.
Calcula on
Solu on: Length of one rope = 83 m 25 cm m cm
8 3 2 5
Length of another rope = 60 m 70 cm
+ 6 0 7 0
 Total length of two ropes 1 4 3 9 5
= 83 m 25 cm + 60 m 70 cm

= 143 m 95 cm

So, the total length of the joined rope is 143 m 95 cm.

Example 8: Ayesha bought a ribbon that measures 112 cm. She cut a piece measuring
91 cm from it. How much ribbon is le with her now?

Solu on: Total length of ribbon bought by Ayesha = 112 cm
Calcula on
= 1 m 12 cm
112 cm
Length of ribbon cut by Ayesha = 91 cm – 91 cm

 Length of ribbon le = 112 cm – 91 cm = 21 cm 21 cm

So, Ayesha has 21 cm of ribbon le with her.

Exercise 11.2

1. Add the following lengths.
(a) 14 m 92 cm and 36 m 53 cm

(b) 5 km 924 m and 6 km 311 m

(c) 61 m 79 cm, 3 m 10 cm and 240 m 8 cm

(d) 9 km 854 m, 2 km 361 m and 1 km 970 m
(e) 108 m 3 cm, 240 m 92 cm and 316 m 25 cm

(f) 41 km 377 m, 23 km 622 m and 30 km 911 m

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