Chapter 3 Playing With Numbers Ex. 3.7
Chapter 3 Playing With Numbers Ex. 3.7 Question 1. Renu purchases two bags of fertiliser of weights 75 kg and 69 kg. Find the maximum value of weight which can measure the weight of the fertiliser exact number of times. Solution: Maximum value of weight which can measure the given weight exact number of time […]
Chapter 3 Playing With Numbers Ex. 3.6
Chapter 3 Playing With Numbers Ex. 3.6 Question 1. Find the HCF 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 Solution: Question 2. What is the HCF […]
Chapter 3 Playing With Numbers Ex. 3.5
Chapter 3 Playing With Numbers Ex. 3.5 Question 1. 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) A number is divisible by 18, if it is divisible […]
Chapter 3 Playing With Numbers Ex. 3.4
Chapter 3 Playing With Numbers Ex. 3.4 Question 1. Find the common factors of: (a) 20 and 28 (b) 15 and 25 (c) 35 and 50 (d) 56 and 120 Solution: (a) Given numbers are : 20 and 28 Factors of 20 are 1, 2, 4, 5, 10, 20 Factors of 28 are 1, 2, […]
Chapter 3 Playing With Numbers Ex. 3.3
Chapter 3 Playing With Numbers Ex. 3.3 Question 1. Using divisibility tests, 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) Solution: Question 2. Using divisibility tests, determine which of following numbers are divisible […]
Chapter 3 Playing With Numbers Ex. 3.2
Chapter 3 Playing With Numbers Ex. 3.2 Question 1. What is the sum of any two: (a) Odd numbers? (b) Even numbers? Solution: (a) The sum of any two odd numbers is even. (b) The sum of any two even numbers is even. Question 2. State whether the following statements are True or False. (a) […]
Chapter 3 Playing With Numbers Ex 3.1
Chapter 3 Playing With Numbers Ex 3.1 Question 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) Factors of 24 are: 24 = 1 x 24; 24 = 2 x 12; 24 = 3 x […]
Chapter 2 Whole Numbers
Chapter 2 Whole Numbers Very Short Answer Type Question 1. Write the smallest whole number. Solution: 0 is the smallest whole number. Question 2. What is the predecessor of whole number 0? Solution: Whole number 0 has no predecessor. Question 3. Which property do the following statements hold? (a) 6 + 4 = 4 + […]
Chapter 2 Whole Numbers Ex 2.3
Chapter 2 Whole Numbers Ex 2.3 Exercise 2.3 Question 1. Question 2. If the product of two whole numbers is zero, can we say that one or both of them will be zero? Justify through examples. Solution: Yes, Examples: 5 x 0 = 0 0 x 8 = 0 0 x 0 = 0 Question […]
Chapter 2 Whole Numbers Ex 2.2
Chapter 2 Whole Numbers Ex 2.2 Question 1. Find the sum by suitable arrangement: (a) 837 + 208 + 363 (b) 1962 + 453,+ 1538 + 647 Solution: (a) 837 + 208 + 363 = (837 + 363) + 208 = 1200 + 208 [Using associative property] = 1408 (b) 1962 + 453 + 1538 […]