Decimals
Exercise 8.3
1). Find the sum in each of the following:
(a) 0.007 + 8.5 + 30.08
(b) 15 + 0.632 + 13.8
(c) 27.076 + 0.55 + 0.004
(d) 25.65 + 9.005 + 3.7
(e) 0.75 + 10.425 + 2
(f) 280.69 + 25.2 + 38
Answer:
(a) 0.007 + 8.5 + 30.08
| 0. | 0 | 0 | 7 | |
| 8. | 5 | 0 | 0 | |
| 3 | 0. | 0 | 8 | 0 |
| 3 | 8. | 5 | 8 | 7 |
Ans: 0.007 + 8.5 + 30.08 = 38.587
(b) 15 + 0.632 + 13.8
| 1 | ||||
| 1 | 5. | 0 | 0 | 0 |
| 0. | 6 | 3 | 2 | |
| 1 | 3. | 8 | 0 | 0 |
| 2 | 9. | 4 | 3 | 2 |
Ans: 15 + 0.632 + 13.8 = 29.432
(c) 27.076 + 0.55 + 0.004
| 1 | 1 | |||
| 2 | 7. | 0 | 7 | 6 |
| 0. | 5 | 5 | 0 | |
| 0. | 0 | 0 | 4 | |
| 2 | 7. | 6 | 3 | 0 |
Ans: 27.076 + 0.55 + 0.004 = 27.630
(d) 25.65 + 9.005 + 3.7
| 1 | 1 | |||
| 2 | 5. | 6 | 5 | 0 |
| 9. | 0 | 0 | 5 | |
| 3. | 7 | 0 | 0 | |
| 3 | 8. | 3 | 5 | 5 |
(e) 0.75 + 10.425 + 2
| 1 | ||||
| 0. | 7 | 5 | 0 | |
| 1 | 0. | 4 | 2 | 5 |
| 2. | 0 | 0 | 0 | |
| 1 | 3. | 1 | 7 | 5 |
(f) 280.69 + 25.2 + 38
| 1 | 1 | |||
| 2 | 8 | 0. | 6 | 9 |
| 2 | 5. | 2 | 0 | |
| 3 | 8. | 0 | 0 | |
| 3 | 4 | 3. | 8 | 9 |
2). Rashid spent ₹35.75 for Maths book and ₹ 32.60 for Science book. Find the total amount spent by Rashid.
Cost of maths book → ₹ 35.75
Cost of science book → ₹ 32.60
| 1 | ||||
| 3 | 5. | 7 | 5 | |
| 3 | 2. | 6 | 0 | |
| 6 | 8. | 3 | 5 |
Ans: Total amount spend by Rashid = ₹ 68.35
3). Radhika’s mother gave her ₹10.50 and her father gave her ₹15.80, find the total amount given to Radhika by the parents.
Amount given by Radhika’s mother → ₹ 10.50
Amount given by Radhika’s father → ₹ 15.80
| 1 | ||||
| 1 | 0. | 5 | 0 | |
| 1 | 5. | 8 | 0 | |
| 2 | 6. | 3 | 0 |
Ans: Total amount given to Radhika’s parents = ₹ 68.35
4). Nasreen bought 3 m 20 cm cloth for her shirt and 2 m 5 cm cloth for her trouser. Find the total length of cloth bought by her.
Cloth bought for shirt → 3 m 20 cm = 3.20 m
Cloth bought for trouser → 2 m 5 cm = 2.05 m
| 3. | 2 | 0 | ||
| 2. | 0 | 5 | ||
| 5. | 2 | 5 |
Ans: Total length of the cloth bought = 5.25 m
5). Naresh walked 2 km 35 m in the morning and 1 km 7 m in the evening. How much distance did he walk in all?
Distance walked in the morning → 2 km 35 m = 2.035 km
Distance walked in the evening → 1 km 7 m = 1.007 km
| 1 | ||||
| 2. | 0 | 3 | 5 | |
| 1. | 0 | 0 | 7 | |
| 3. | 0 | 4 | 2 |
Ans: Total distance walked by Naresh = 3.042 km
6). Sunita travelled 15 km 268 m by bus, 7 km 7 m by car and 500 m on foot in order to reach her school. How far is her school from her residence?
Distance travelled by bus → 15 km 268 m = 15.268 km
Distance travelled by car → 7 km 7 m = 7.007 km
Distance travelled on foot → 500 m = 0.500 km
| 1 | 1 | |||
| 1 | 5. | 2 | 6 | 8 |
| 7. | 0 | 0 | 7 | |
| 0. | 5 | 0 | 0 | |
| 2 | 2. | 7 | 7 | 5 |
Ans: Total distance travelled by Sunita = 22.775 km
7). Ravi purchased 5 kg 400 g rice, 2 kg 20 g sugar and 10 kg 850g flour. Find the total weight of his purchases.
Weight of rice purchased → 5 kg 400 g = 5.400 kg
Weight of sugar purchased → 2 kg 20 g = 2.020 kg
Weight of flour purchased → 10 kg 850 g = 10.850 kg
| 5. | 4 | 0 | 0 | |
| 2. | 0 | 2 | 0 | |
| 1 | 0. | 8 | 5 | 0 |
| 1 | 8. | 2 | 7 | 5 |
Ans: Total weight of the purchases = 18.275 kg
