Chapter 3: Playing With Numbers Exercise 3.1 Q1. 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 Answer. (a) 24 = 1 x 24 = 2 x 12 = 3 x 8 = 4 x 6 = 6 x … Read more
Chapter 3: Playing With Numbers Exercise 3.2 Q1. What is the sum of any two: (a) Odd numbers. (b) Even numbers. Answer. (a) The sum of any two odd numbers is an even number. Example: 1 + 7 = 8, 7 + 5 = 12 (b) The sum of any two even numbers is also an … Read more
Exercise 3.3 Q1. Using divisibility test, determine which of the following numbers are divisible by 2; by 3; by 4; by 5; by 6; by 8; by 9; by 10; by 11. (Say yes or no) Answer. Number Divisible by 2 3 4 5 6 8 9 10 11 128 Yes No Yes No No … Read more
Chapter 3: Playing With Numbers Exercise 3.4 Q1. Find the common factors of: (a) 20 and 28 (b) 15 and 25 (c) 35 and 50 (d) 56 and 120 Answer. (a) Factors of 20 = 1, 2, 4, 5, 10, 20 Factors of 28 = 1, 2, 4, 7, 14, 28 Common factors = 1, 2, … Read more
Chapter 3: Playing With Numbers Exercise 3.5 Q1. Which of the following statements are true: (a) If a number is divisible by 3, it must be divisible by 9. (b) If a number is divisible by 9, it must be divisible by 3. (c) If a number is divisible by 18, it must be divisible by … Read more
Chapter 3: Playing With Numbers Exercise 3.6 Q1. Find the H.C.F. of the following numbers: (a) 18, 48 (b) 30, 42 (c) 18, 60 (d) 27, 63 (e) 36, 84 (f) 34, 102 (g) 70, 105, 175 (h) 91, 112, 49 (i) 18, 54, 81 (j) 12, 45, 75 Answer. (a) Factors of 18 = 2 … Read more
Chapter 1: Knowing Your Numbers Exercise 1.1 Q1. Fill in the blanks: (a) 1 lakh = _______________ ten thousand (b) 1 million = _______________ hundred thousand (c) 1 crore = _______________ ten lakh (d) 1 crore = _______________ million (e) 1 million = _______________ lakh Answer. (a) 10 (b) 10 (c) 10 (d) 10 (e) 10 … Read more
Chapter 1: Knowing Your Numbers Exercise 1.2 Q1. A book exhibition was held for four days in a school. The number of tickets sold at the counter on the first, second, third and final day was respectively 1094, 1812, 2050 and 2751. Find the total number of tickets sold on all the four days. Answer. … Read more
Chapter 1: Knowing Your Numbers Exercise 1.3 Q1. Estimate each of the following using general rule: (a) 730 + 998 (b) 796 – 314 (c) 12,904 + 2,888 (d) 28,292 – 21,496 Answer. (a) 730 round off to 700 998 round off to 1000 Estimated sum = 1700 (b) 796 round off to 800 314 … Read more
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