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# Decimals - Exercise 7.8 Class 6 Notes | EduRev

## Class 6 : Decimals - Exercise 7.8 Class 6 Notes | EduRev

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Exercise 7.8                                                                             page: 7.28
1. Find the sum in each of the following:

Solution:

(i) We know that
102.360 + 7.054 + 0.800 = 110.214

(ii) We know that
0.060 + 4.108 + 91.500 = 95.668

(iii) We know that
312.800 + 290.020 + 128.457 = 731.277

(iv) We know that
113.285 + 6.700 + 9.340 + 30.080 = 159.405

(v) We know that
3.42 + 264.08 + 7.6 + 95.321 = 370.421

(vi) We know that
18.003 + 41.700 + 10.950 + 5.057 = 75.710

2. Add the following:
(i) 41.8, 39.24, 5.01 and 62.6
(ii) 4.702, 4.2, 6.02 and 1.27
(iii) 18.03, 146.3, 0.829 and 5.324
Solution:

(i) 41.8, 39.24, 5.01 and 62.6
It can be written as
41.80 + 39.24 + 5.01 + 62.60 = 148.65

(ii) 4.702, 4.2, 6.02 and 1.27
It can be written as
4.702 + 4.200 + 6.020 + 1.270 = 16.192

(iii) 18.03, 146.3, 0.829 and 5.324
It can be written as
Page 2

Exercise 7.8                                                                             page: 7.28
1. Find the sum in each of the following:

Solution:

(i) We know that
102.360 + 7.054 + 0.800 = 110.214

(ii) We know that
0.060 + 4.108 + 91.500 = 95.668

(iii) We know that
312.800 + 290.020 + 128.457 = 731.277

(iv) We know that
113.285 + 6.700 + 9.340 + 30.080 = 159.405

(v) We know that
3.42 + 264.08 + 7.6 + 95.321 = 370.421

(vi) We know that
18.003 + 41.700 + 10.950 + 5.057 = 75.710

2. Add the following:
(i) 41.8, 39.24, 5.01 and 62.6
(ii) 4.702, 4.2, 6.02 and 1.27
(iii) 18.03, 146.3, 0.829 and 5.324
Solution:

(i) 41.8, 39.24, 5.01 and 62.6
It can be written as
41.80 + 39.24 + 5.01 + 62.60 = 148.65

(ii) 4.702, 4.2, 6.02 and 1.27
It can be written as
4.702 + 4.200 + 6.020 + 1.270 = 16.192

(iii) 18.03, 146.3, 0.829 and 5.324
It can be written as

18.030 + 146.300 + 0.829 + 5.324 = 170.483

3. Find the sum in each of the following:
(i) 0.007 + 8.5 + 30.08
(ii) 280.69 + 25.2 + 38
(iii) 25.65 + 9.005 + 3.7
(iv) 27.076 + 0.55 + 0.004
Solution:

(i) 0.007 + 8.5 + 30.08
It can be written as
0.007 + 8.500 + 30.080 = 38.587

(ii) 280.69 + 25.2 + 38
It can be written as
280.69 + 25.20 + 38.00 = 343.89

(iii) 25.65 + 9.005 + 3.7
It can be written as
25.650 + 9.005 + 3.700 = 38.355

(iv) 27.076 + 0.55 + 0.004
It can be written as
27.076 + 0.550 + 0.004 = 27.630

4. Radhika’s mother gave her Rs 10.50 and her father gave her Rs 15.80, find the total amount given to
Radhika by her parents.
Solution:

Amount given by Radhika’s mother = Rs 10.50
Amount given by Radhika’s father = Rs 15.80
So the total amount given by her parents = Rs 10.50 + Rs 15.80 = Rs 26.30

Hence, the total amount given by her parents is Rs 26.30.

5. Rahul bought 4 kg 90 g apples, 2 kg 60 g of grapes and 5 kg 300 g of mangoes. Find the weight of the
fruits he bought in all.
Solution:

Weight of apples bought by Rahul = 4 kg 90 g = 4.090 kg
Weight of grapes bought by Rahul = 2 kg 60 g = 2.060 kg
Weight of mangoes bought by Rahul = 5 kg 300 g = 5.300 kg
So the weight of all the fruits = 4.090 + 2.060 + 5.300 = 11.450 kg

Hence, the weight of the fruits bought by Rahul is 11.450 kg.

6. Nasreen bought 3 m 20 cm cloth for her shirt and 2 m 5 cm cloth for skirt. Find the total cloth bought by
her.
Solution:

Page 3

Exercise 7.8                                                                             page: 7.28
1. Find the sum in each of the following:

Solution:

(i) We know that
102.360 + 7.054 + 0.800 = 110.214

(ii) We know that
0.060 + 4.108 + 91.500 = 95.668

(iii) We know that
312.800 + 290.020 + 128.457 = 731.277

(iv) We know that
113.285 + 6.700 + 9.340 + 30.080 = 159.405

(v) We know that
3.42 + 264.08 + 7.6 + 95.321 = 370.421

(vi) We know that
18.003 + 41.700 + 10.950 + 5.057 = 75.710

2. Add the following:
(i) 41.8, 39.24, 5.01 and 62.6
(ii) 4.702, 4.2, 6.02 and 1.27
(iii) 18.03, 146.3, 0.829 and 5.324
Solution:

(i) 41.8, 39.24, 5.01 and 62.6
It can be written as
41.80 + 39.24 + 5.01 + 62.60 = 148.65

(ii) 4.702, 4.2, 6.02 and 1.27
It can be written as
4.702 + 4.200 + 6.020 + 1.270 = 16.192

(iii) 18.03, 146.3, 0.829 and 5.324
It can be written as

18.030 + 146.300 + 0.829 + 5.324 = 170.483

3. Find the sum in each of the following:
(i) 0.007 + 8.5 + 30.08
(ii) 280.69 + 25.2 + 38
(iii) 25.65 + 9.005 + 3.7
(iv) 27.076 + 0.55 + 0.004
Solution:

(i) 0.007 + 8.5 + 30.08
It can be written as
0.007 + 8.500 + 30.080 = 38.587

(ii) 280.69 + 25.2 + 38
It can be written as
280.69 + 25.20 + 38.00 = 343.89

(iii) 25.65 + 9.005 + 3.7
It can be written as
25.650 + 9.005 + 3.700 = 38.355

(iv) 27.076 + 0.55 + 0.004
It can be written as
27.076 + 0.550 + 0.004 = 27.630

4. Radhika’s mother gave her Rs 10.50 and her father gave her Rs 15.80, find the total amount given to
Radhika by her parents.
Solution:

Amount given by Radhika’s mother = Rs 10.50
Amount given by Radhika’s father = Rs 15.80
So the total amount given by her parents = Rs 10.50 + Rs 15.80 = Rs 26.30

Hence, the total amount given by her parents is Rs 26.30.

5. Rahul bought 4 kg 90 g apples, 2 kg 60 g of grapes and 5 kg 300 g of mangoes. Find the weight of the
fruits he bought in all.
Solution:

Weight of apples bought by Rahul = 4 kg 90 g = 4.090 kg
Weight of grapes bought by Rahul = 2 kg 60 g = 2.060 kg
Weight of mangoes bought by Rahul = 5 kg 300 g = 5.300 kg
So the weight of all the fruits = 4.090 + 2.060 + 5.300 = 11.450 kg

Hence, the weight of the fruits bought by Rahul is 11.450 kg.

6. Nasreen bought 3 m 20 cm cloth for her shirt and 2 m 5 cm cloth for skirt. Find the total cloth bought by
her.
Solution:

Cloth bought by Nasreen for shirt = 3 m 20 cm = 3.20 m
Cloth bought by Nasreen for skirt = 2 m 50 cm = 2.05 m
So the total cloth bought by her = 3.20 + 2.05 = 5.25 m = 5 m 25 cm

Hence, the total cloth bought by her is 5 m 25 cm.

7. Sunita travels 15 km 268 m by bus, 7 km 7 m by car and 500 m by foot in order to reach her school. How
far is her school from her residence?
Solution:

Distance travelled by Sunita by bus = 15 km 268 m = 15.268 km
Distance travelled by Sunita by car = 7 km 7 m = 7.007 km
Distance travelled by Sunita by foot = 500 m = 0.500 km
So the distance from residence to school = 15.268 + 7.007 + 0.500 = 22.775 km

Hence, the distance from her residence to school is 22.775 km.

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## Mathematics (Maths) Class 6

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