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Question 2.Find the cost of 8 kg of rice, if the cost of 10 kg is Rs 325.Solution:Cost of 10 kg rice = Rs 325∴ Cost of 10 kg riceCost of 8 kg rice = Cost of 1 kg rice x 8∴ The cost of 8 kg rice is Rs 260. Question 3.If 14 chairs … Read more

Question 1.In each example below, find the ratio of the first number to the second:i. 24, 56ii. 63,49iii. 52, 65iv. 84, 60v. 35, 65vi. 121, 99Solution: Question 2.Find the ratio of the first quantity to the second.i. 25 beads, 40 beadsii. Rs 40, Rs 120iii. 15 minutes, 1 houriv. 30 litres, 24 litresv. 99 kg, … Read more

Chapter 10 Equations Set 10.2 Question 1.Rewrite the following using a letter:i. The sum of a certain number and 3.ii. The difference is obtained by subtracting 11 from another number.iii. The product of 15 and another number.iv. Four times a number is 24.Solution:i. Let the number be x.∴ x + 3 represents the sum of … Read more

Chapter 10 Equations Set 10.1 Question 1.Different mathematical operations are given in the two rows below. Find out the number you get in each operation and make equations. Solution: ∴ The equations are

Question 1.Find out the LCM of the following numbers.i. 9,15ii. 2,3,5iii. 12,28iv. 15,20v. 8,11Solution:i. Multiples of 9 = 9, 18, 27, 36, 45, 54, 63, 72, 81, 90Multiples of 15 = 15, 30, 45∴ LCM of 9 and 15 = 45 ii. Multiples of 2 = 2, 4,6, 8, 10, 12, 14, 16, 18, 20, … Read more

Question 1.Find the HCF of the following numbers.i. 45, 30ii. 16, 48iii. 39, 25iv. 49, 56v. 120, 144vi. 81, 99vii. 24, 36viii. 25, 75ix. 48, 54x. 150, 225Solution:i. Factors of 45 = 1, 3, 5, 9,15, 45Factors of 30 = 1, 2, 3, 5, 6, 10, 15, 30∴ HCF of 45 and 30 = 15 … Read more

Question 1.Write all the factors of the given numbers and list their common factors:i. 12, 16ii. 21, 24iii. 25, 30iv. 24, 25v. 56, 72Solution:i. Factors of 12 = 1, 2, 3, 4, 6, 12Factors of 16 = 1, 2, 4, 8, 16∴ Common factors of 12 and 16 = 1, 2, 4 ii. Factors of … Read more

Question 1.There are some flowering trees in a garden. Each tree bears many flowers with the same number printed on it. Three children took a basket each to pick flowers. Each basket has one of the numbers, 3, 4 or 9 on it. Each child picks those flowers which have numbers divisible by the number … Read more

Question 1.Along each figure shown below, a line l has been drawn. Complete the symmetrical figures by drawing a figure on the other side such that the line l becomes the line of symmetry. Solution: Intext Questions and Activities Question 1.In the figures below, the line l divides the figure in two parts. Do these … Read more

Question 1.Draw the axes of symmetry of each of the figures below. Which of them has more than one axis of symmetry? Solution:Figures (i), (ii) and (iv) have more than one axis of symmetry. Question 2.Write the capital letters of the English alphabet in your notebook. Try to draw their axes of symmetry. Which ones … Read more