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E:\Working\Focus_Learning\Math_Genius_4_(25-10-2023)\Open_Files\Chap-10
\\December 11, 2023 5:25 PM Bharat Arora P-6 Reader _________________________ Date: ___________________74

3. Convert the following into m.
(a) 24 km (b) 96 km (c) 8 km 417 m (d) 26 km 42 m

4. Convert the following into dm.
(a) 39 m (b) 118 m (c) 19 m 9 dm (d) 109 m 2 dm
5. Convert the following into dam.

(a) 13 km (b) 18 hm (c) 5 km 10 hm
6. Convert the following into metres.

(a) 2 km 1 hm 6 dam 8 m (b) 12 km 6 hm 9 dam 4 m
7. Convert the following.

(a) 105 mm into cm and mm (b) 685 cm into m and cm

(c) 8000 m into km (d) 16300 m into km and m

8. Convert the following.

(a) 18 ft into in (b) 5 ft 24 in into in
(c) 108 in into ft (d) 141 in into ft and in

additiOn and SuBtractiOn Of Length

In class 3, we have learned that we arrange the given measures in appropriate
columns and then add or subtract column-wise.

example 1: Add the following:

(a) 32 m 76 cm 5 mm and 8 m 35 cm 8 mm
(b) 13 km 975 m 32 cm and 5 km 688 m 55 cm

Solution: (a) (b)
m cm mm km m cm

1 1 1 1 1 1 1

3 2 7 6 5 1 3 9 7 5 3 2
+ 8 3 5 8 + 5 6 8 8 5 5
4 1 1 2 3 1 9 6 6 3 8 7

Thus, 32 m 76 cm 5 mm + 8 m Thus, 13 km 975 m 32 cm + 5 km

35 cm 8 mm = 41 m 12 cm 3 mm 688 m 55 cm = 19 km 663 m 87 cm
example 2: Subtract the following:

(a) 9 m 76 cm 4 mm from 18 m 25 cm 9 mm

(b) 16 km 245 m 90 cm from 30 km 120 m 50 m
teacher’s Encourage students to keep the process of coming or borrowing in mind. It will help them in doing calculation
tip fast.

180 Mathematics-4