R d sharma solutions mathematics class 7 Solutions for Chapter 3 decimals

Exercises in Chapter 3 decimals Grade 7

Decimals Exercise 3.1

Decimals Exercise 3.2

Decimals Exercise 3.3

Questions in Decimals Exercise 3.1

Find the product:

(i) 4.74 × 10

(ii) 0.45 × 10

(iii) 0.0215 × 10

(iv) 0.0054 × 10

Write each of the following as decimals:

(i) (8/100)

(ii) 20 + (9/10) + (4/100)

(iii) 23 + (2/10) + (6/1000)

Convert each of the following fractions as decimals:

(i) 0.04

(ii) 2.34

(iii) 0.342

(iv) 17.38

Express the following fractions as decimals:

(i) (23/10)

(ii) 25 (1/8)

(iii) 39 (7/35)

(iv) 15 (1/25)

Add the following:

(i) 41.8, 39.24, 5.01 and 62.6

(ii) 18.03, 146.3, .829 and 5.324

Find the value of:

(i) 9.756 – 6.28

(ii) 48.1 – 0.37

(iii) 108.032 – 86.8

(iv) 100 – 26.32

Take out of 3.547 from 7.2

What is to be added to 36.85 to get 59.41?

What is to be subtracted from 17.1 to get 2.051?

By how much should 34.79 be increased to get 70.15?

By how much should 59.71 be decreased to get 34.58?

Questions in Decimals Exercise 3.2

Find the product:

(i) 35.853 × 100

(ii) 42.5 × 100

(iii) 12.075 × 100

(iv) 100 × 0.005

Find the product:

(i) 2.506 × 1000

(ii) 20.708 × 1000

(iii) 0.0529 × 1000

(iv) 1000 × 0.1

Find the product:

(i) 3.14 × 17

(ii) 0.745 × 12

(iii) 28.73 × 47

(iv) 0.0415 × 59

Find:

(i) 1.07 × 0.02

(ii) 211.9 × 1.13

(iii) 10.05 × 1.05

(iv) 13.01 × 5.01

Find the area of a rectangle whose length is 5.5m and breadth is 3.4m

If the cost of a book is Rs 25.57, find the cost 0f 24 such books.

A car covers a distance of 14.75km in one liter of petrol. How much distance itwill cover in 15.5 liters of petrol?

One kg of rice costs Rs 42.65. What will be the cost of 18.25 kg ofrice?

One meter of cloth costs Rs 152.50. What is the cost of 10.75 meters ofcloth?

Questions in Decimals Exercise 3.3

Divide:

(i) 142.45 by 10

(ii) 54.25 by 10

(iii) 3.45 by 10

(iv) 0.57 by 10

(v) 0.0043 by 10

(vi) 0.004 by 10

Divide:

(i) 459.5 by 100

(ii) 74.3 by 100

(iii) 5.8 by 100

(iv) 0.7 by 100

(v) 0.48 by 100

(vi) 0.03 by 100

Divide:

(i) 235. 41 by 1000

(ii) 29.5 by 1000

(iii) 3.8 by 1000

(iv) 0.7 by 1000

Divide:

(i) 0.45 by 9

(ii) 217.44 by 18

(iii) 319.2 by 2.28

(iv) 40.32 by 9.6

(v) 0.765 by 0.9

(vi) 0.768 by 1.6

Divide:

(i) 16.64 by 20

(ii) 0.192 by 12

(iii) 163.44 by 24

(iv) 403.2 by 96

(v) 16.344 by 12

(vi) 31.92 by 228

Divide:

(i) 15.68 by 20

(ii) 164.6 by 200

(iii) 403.80 by 30

Divide:

(i) 76 by 0.019

(ii) 88 by 0.08

(iii) 148 by 0.074

(iv) 7 by 0.014

Divide:

(i) 20 by 50

(ii) 8 by 100

(iii) 72 by 576

(iv) 144 by 15

A vehicle covers a distance 0f 43.2 kmin 2.4 litres of petrol. How much distance will travel in 1 litre of petrol?

The total weight of some bags of wheat is 1743 kg. If each bag weighs 49.8 kg,how many bags are there?

Shikha cuts 50 m of cloth into pieces 0f 1.25 m each. How many pieces doesshe get?

Each side of a rectangular polygon is 2.5cm in length. The perimeter of thepolygon is 12.5 cm. How many sides does the polygon have?

The product of two decimals is 42.987. If one of them is 12.46, find theother.

The weight of 34 bags of sugar is 3483.3 kg.If all bags weigh equally, findthe weight of each bag.

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Chapters in this book

Integers

Fractions

Decimals

Rational Numbers

Operations on Rational Numbers

Exponents

Algebraic Expressions

Linear Equations In One Variable

Ratio and Proportion

Unitary Method

Percentage

Profit and Loss

Simple Interest

Lines and Angles

Properties of Triangle

Congruence

Constructions

Symmetry

Visualising Solid Shapes

Mensuration 1

Mensuration 2 Area of Circle

Data Handling-Collection Organisation Data

Data Handling-Central Values

Data Handling-Construction Of Bar Graphs

Data Handling-Probability