# Decimals

## Exercise 8.4

1). Subtract :

(a) ₹18.25 from ₹ 20.75

1 10

20.75

18.25

2.50

Ans: ₹18.25 from ₹ 20.75 is ₹ 2.50

(b) 202.54 m from 250 m

4 9 9 10

2 5 0.0 0

2 0 2.5 4

047.46

202.54 m from 250 m is 47.46 m

(c) ₹ 5.36 from ₹ 8.40

3 10

- 4 0
- 3 6
- 0 4

₹ 5.36 from ₹ 8.40 is ₹ 3. 04

(d) 2.051 km from 5.206 km

1 10

5.2 0 6

2.0 5 1

3.1 5 5

2.051 km from 5.206 km is 3.55 km

(e) 0.314 kg from 2.107 kg

1 10 10

- 1 0 7
- 3 1 4
- 7 9 3

0.314 kg from 2.107 kg is 1.793 kg

2). Find the value of :

(a) 9.756 – 6.28

6 15

- 7 5 6
- 2 8 0
- 4 7 6

9.756 – 6.28 = 3.476

(b) 21.05 – 15.27

1 10 9 15

2 1. 0 5

1 5. 2 7

0 5. 7 8

(c) 18.5 – 6.79

7 14 10

1 8. 5 0

- 7 9

1 1. 7 1

(d) 11.6 – 9.847

0 10 15 9 10

1 1. 6 0 0

- 8 4 7

0 1. 7 5 3

3). Raju bought a book for ₹35.65. He gave ₹ 50 to the shopkeeper. How much money did he get back from the shopkeeper?

Money given by Raju → ₹ 50

Cost of the book → ₹ 35.65

Money Raju get back from the shopkeeper =

4 9 9 10

5 0. 0 0

3 5. 6 5

1 4. 3 5

Ans: Money Raju get back from the shopkeeper = ₹ 14.35

4). Rani had ₹18.50. She bought one ice-cream for ₹ 11.75. How much money does she have now?

Total money with Rani → ₹ 18.50

Cost of ice-cream → ₹ 11.75

Money left with Rani =

7 14 10

1 8. 5 0

1 1. 7 5

0 6. 7 5

Money left with Rani = ₹ 6.75

5). Tina had 20 m 5 cm long cloth. She cuts 4 m 50 cm length of cloth from this for making a curtain. How much cloth is left with her?

Total length of the cloth → 20 m 5 cm = 20.05 cm (1 m = 100cm)

Length of the cloth cut → 4 m 50 cm = 4.50 m

Cloth left with Rani =

1 9 10

2 0. 0 5

- 5 0

1 5. 5 5

Cloth left with Rani = 15 m 55 cm

6). Namita travels 20 km 50 m every day. Out of this she travels 10 km 200 m by bus and the rest by auto. How much distance does she travel by auto?

Total distance travelled by Namita → 20 km 50 m = 20.050 km

(1 km = 1000 m)

Distance travelled by bus → 10 km 200 m = 10.200 km

Distance travelled by auto =

1 9 10

2 0. 0 5 0

1 0. 2 0 0

0 9. 8 5 0

Distance travelled by auto = 9 km 850 m

7). Aakash bought vegetables weighing 10 kg. Out of this, 3 kg 500 g is onions, 2 kg 75 g is tomatoes and the rest is potatoes. What is the weight of the potatoes?

Total weight of the vegetables → 10 kg

Weight of the onions → 3 kg 500 g = 3.500 kg (1 kg = 1000 g)

Weight of the tomatoes → 2 kg 75 g = 2.075 kg

Weight of the potatoes = total weight of the vegetable – (weight of the

Onions + weight of the tomatoes)

= 10 – (3.500 + 2.075)

0 9 9 9 10

- 5 0 0 1 0. 0 0 0

+ 2. 0 7 5 – 5. 5 7 5

- 5 7 5 0 4. 4 2 5

Weight of the potatoes = 4 kg 425 g

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