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 […]
Chapter 2 Whole Numbers Ex 2.1
Chapter 2 Whole Numbers Ex 2.1 Question 1. Write the next three natural numbers after 10999. Solution: The next three natural numbers after 10999 are 11000, 11001 and 11002. Question 2. Write three whole numbers occurring just before 10001. Solution: 10001 – 1 = 10000 10000 – 1 = 9999 9999 – 1 = 9998 […]
Chapter 1 Knowing Our Numbers
Chapter 1 Knowing Our Numbers Very Short Answer Type Question 1. Write the smallest three digit number whose value does not change on reversing its digits. Solution: The required number is 101. Question 2. Write the greatest three digit number which does not change on reversing its digits. Solution: The required number is 999. Question […]
Chapter 1 Knowing Our Numbers Exercise 1.1
Chapter 1 Knowing Our Numbers Exercise 1.1 Question 1. 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. Solution: (a) 1 lakh = ten ten thousand. (b) 1 […]
Chapter 1 Knowing Our Numbers Ex 1.3
Chapter 1 Knowing Our Numbers Ex 1.3 Question 1. Estimate each of the following using general rule: (a) 730 + 998 (b) 796 – 314 (c) 12,904 + 2,888 (d) 28,292 – 21,496 Make ten more such examples of addition, subtraction and estimation of their outcome. Solution: (a) 730 + 998 Rounding off 730 nearest […]