Page 140 - ICSE Math 4

2. Convert the following to cen metres.
(a) 17 m (b) 27 m (c) 98 m

(d) 18 m 26 cm (e) 24 m 98 cm (f) 8 m 64 cm
3. Convert the following to metres and cen metres.

(a) 292 cm (b) 614 cm (c) 125 cm
(d) 3,926 cm (e) 2,318 cm (f) 4,000 cm

4. Convert the following to metres.

(a) 65 km 204 m (b) 23 km 987 m (c) 760 km 194 m
(d) 164 km 287 m (e) 32 km 876 m (f) 98 km 870 m

5. Convert the following to kilometres, or kilometres and metres.
(a) 87,230 m (b) 54,159 m (c) 19,452 m

(d) 7,876 m (e) 85,721 m (f) 38,655 m

Addition and Subtraction of Lengths

To add or subtract lengths, we write the given units in diff erent columns separately.
Arrange the given values under these units, and then add or subtract.

Example 5: Add 9 m 56 cm and 13 m 78 cm. m cm

1
1
Solu on: Step 1: Arrange the given values under the 1 9 5 6
correct columns of units.
+ 1 3 7 8
Step 2: Add the cen metres fi rst.
2 3 1 3 4
56 cm + 78 cm = 134 cm = 1 m 34 cm

Write 34 under cen metres and carry over 1 to the metres column.
Step 3: Add the metres along with the carry over.

9 m + 13 m + 1 m (carry over) = 23 m

Write 23 under metres.
So, the sum of the given lengths is 23 m 34 cm.
Example 6: Subtract 45 m 98 cm from 73 m 62 cm.

m cm
Solu on: Step 1: Arrange the given values under the correct
6 12 1 5 12
columns of units. 7 2 1 6 2
7 3 6 2
Step 2: Subtract the cen metres fi rst.
– 4 5 9 8
Since 98 is greater than 62, it cannot be
2 7 6 4
subtracted. So, borrow 1 m from 73 m.

Thus, 73 m – 1 m = 72 m.
So, 62 cm becomes 1 m 62 cm, i.e., 100 cm + 62 cm = 162 cm.

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