Page 1 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.Read More

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