Simple Equations Exercise 4.4 1). Set up equations and solve them to find the unknown numbers in the following cases: (a) Add 4 to eight times a number; you get 60. Let the given number be x By the given condition of the problem 8x + 4 = 60 Transposing 4 to RHS 8x […]
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Simple Equations Exercise 4.2 1). Give first the step you will use to separate the variable and then solve the equation: (a) x – 1 = 0 (b) x + 1 = 0 (c) x – 1 = 5 (d) x + 6 = 2 (e) y – 4 = – 7
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Simple Equations Exercise 4.1 1). Complete the last column of the table. Answer: S No. Equation Value Say, whether the Equation is satisfied (Yes/No) i x + 3 = 0 x = 3 No ii x + 3 = 0 x = 0 No iii x + 3 = 0 x = -3 Yes iv
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Data Handling Exercise 3.1 1). Find the range of heights of any ten students of your class. The heights of any ten students of the class are 134, 132, 132, 135, 124, 130, 128, 141, 125, 137. Highest height = 141 Lowest height = 124 Range = highest height – lowest height
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Fractions and Decimals Exercise 2.2 1). Which of the drawings (a) to (d) show: (i) 2 X 1/5 (ii) 2 X ½ (iii) 3 X 1/3 (iv) 3 X ¼ Answers: 2). Some pictures (a) to (c) are given below. Tell which of them show (i) 3 X 1/5 = 3/5 (ii) 2 X 1/3
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Fractions and Decimals Exercise 2.1 1). Solve: i). 2 – 3/5 ii). 4 + 7/8 iii). 3/5 + 2/7 iv). 9/11 – 4/15 v). 7/10 + 2/5 + 3/2 vi). 22/3 + 3 1/2 vii). 81/2 – 3 5/8 2). Arrange the following in descending order. i). 2/9, 2/3, 8/21 ii). 1/5, 3/7,
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Integers Exercise 1.3 Questions with (*) sign are open-ended questions. 1). Evaluate each of the following: (a) (–30) ÷ 10 (b) 50 ÷ (–5) (c) (–36) ÷ (–9) (d) (– 49) ÷ (49) (e) 13 ÷ [(–2) + 1] (f) 0 ÷ (–12) (g) (–31) ÷ [(–30) + (–1)] (h) [(–36) ÷ 12] ÷ 3
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Integers Exercise 1.2 Questions with (*) sign are open-ended questions. Exercise 1.3 1). Find each of the following products: (a) 3 × (–1) 3 × (–1) = -3 (b) (–1) × 225 (–1) × 225 = -225 (c) (–21) × (–30) (–21) × (–30) = 630 (d) (–316) × (–1) (–316) ×
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