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

8. 4 0
9. 3 6
10. 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

2. 1 0 7
3. 3 1 4
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

9. 7 5 6
10. 2 8 0
11. 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

6. 7 9

       1 1. 7 1

 

 

(d) 11.6 – 9.847

 

        0 10 15  9  10

1 1. 6 0 0

9. 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

4. 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

3. 5 0 0 1 0. 0 0 0

    + 2. 0 7 5                                   –    5. 5 7 5

5. 5 7 5 0 4. 4 2 5

 

 

Weight of the potatoes = 4 kg 425 g

 

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