# 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