## Chapter 2: Whole Numbers

Ex-2.1 1.Write the next three natural numbers after 10999. Solution: Three natural number = 1,2,3. The next three natural number after 10999 10999 + 1 = 11000 10999 + 2 = 11001 10999+ 3 = 11002 2….

## Chapter 1: Knowing Our Numbers

Ex- 1.1 1. Fill in the blanks: (a) 1 lakh = _______ ten thousand. (b) 1 million = _______ hundred thousand. (c) 1 crore = _______ ten lakhs. (d) 1 crore = _______ million. (e) 1 million…

## Chapter 3: Playing with Numbers

Ex- 3.1 1. Write all the factors of the following numbers: (a) 24 (b) 15 (c) 21 (d) 27 (e) 12 (f) 20 (g) 18 (h) 23 (i) 36 Solution: (a) 1, 2, 3, 4, 6,…

## Chapter 4: Basic Geometrical Ideas

EXERCISE 4.1 1. Use the figure to name: (a) Five points (b) A line (c) Four rays (d) Five line segments Solutions: (a) The five points are D, E, O, B and C (b) A line is (c)…

## Chapter 5: Understanding Elementary Shapes

Exercise-5.1 1. What is the disadvantage in comparing line segments by mere observation? Solutions: By mere observation we can’t compare the line segments with slight difference in their length. We can’t say which line segment is of…

## Chapter 6: Integers

Integers Ex- 6.1 1. Write opposites of the following: (a) Increase in weight (b) 30 km north (c) 80 m east (d) Loss of Rs 700 (e) 100 m above sea level Solution: We use the concept…

## Chapter 7: Fractions

EXERCISE 7.1 Solution: = 2/4 = 8/9 = 4/8 = 1/4 = 3/7 = 3/9 = 10/10 = 1 = 4/9 = 3/8 = 4/8 2. Color the part according to the given fraction. Solution: 3….

## Chapter 8: Decimals

EXERCISE 8.1 Solution: Hundreds (100) Tens (10) Ones (1) Tenths (1/10) 0 3 1 2 1 1 0 4 2. Write the following decimals in the place value table. (a) 19.4 (b) 0.3 (c)…

## Chapter 9: Data Handling

EXERCISE 9.1 (a) Find how many students obtained marks equal to or more than 7. (b) How many students obtained marks below 4? Solution: (a) 12 (b) 8 2. Following is the choice of sweets of 30…

## Chapter 10: Mensuration

EXERCISE 10.1 1. Find the perimeter of each of the following figures: Solution: (a) Perimeter = sum of all sides = AB + BC + CD + AD = (4 + 2 + 1 + 5) cm…

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