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
Chapter 2: Whole Numbers Exercise 2.1 Q1. Write the next three natural numbers after 10999. Answer. 10,999 + 1 = 11,000 11,000 + 1 = 11,001 11,001 + 1 = 11,002 Q2. Write the three whole numbers occurring just before 10001. Answer. 10,001 – 1 = 10,000 10,000 – 1 = 9,999 9,999 – 1 = … Read more
Chapter 2: Whole Numbers Exercise 2.2 Q1. Find the sum by suitable rearrangement: (a) 837 + 208 + 363 (b) 1962 + 453 + 1538 + 647 Answer. (a) 837 + 208 + 363 = (837 + 363) + 208 = 1200 + 208 = 1408 (b) 1962 + 453 + 1538 + 647 = (1962 … Read more
Chapter 2: Whole Numbers Exercise 2.3 Q1. Which of the following will not represent zero: (a) 1 + 0 (b) 0 x 0 (c) (d) Answer. (a) is equal to 1 Q2. If the product of two whole numbers is zero, can we say that one or both of them will be zero? Justify through … Read more
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
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