Chapter 5 Lines and Angles Exercise 5.1
Chapter 5 Lines and Angles Exercise 5.1 Question 1. Find the complement of each of the following angles: Solution: (i) Complement of 20° = 90° – 20° = 70° (ii) Complement of 63° = 90° – 63° = 27° (iii) Complement of 57° = 90° – 57° = 33° Question 2. Find the supplement of […]
Chapter 4 Simple Equations
Chapter 4 Simple Equations Very Short Answer Type Question 2. Convert the following equations in statement form: (a) 5x = 20 (b) 3y + 7 = 1 Solution: (a) Five times a number x gives 20. (b) Add 7 to three times a number y gives 1. Question 3. If k + 7 = 10, […]
Chapter 4 Simple Equations Exercise 4.4
Chapter 4 Simple Equations Exercise 4.4 Question 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. (b) One-fifth of a number minus 4 gives 3. (c) If I take three-fourths of a number and add 3 to […]
Chapter 4 Simple Equations Exercise 4.3
Chapter 4 Simple Equations Exercise 4.3 Question 1. Solve the following equations: Solution: (b) 3(n – 5) = 21 ⇒ (Dividing both sides by 3) ⇒ n – 5 = 7 ⇒ n = 7 + 5 (Transposing 5 to RHS) n = 12 Check: Put n = 12 in LHS 3(12 – 5) = […]
Chapter 4 Simple Equations Exercise 4.2
Chapter 4 Simple Equations Exercise 4.2 Question 1. Given 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 (f) […]
Chapter 4 Simple Equations Exercise 4.1
Chapter 4 Simple Equations Exercise 4.1 Question 1. Complete the given column of the table: Solution: Question 2. Check whether the value given in the brackets is a solution to the given equation or not: (a) n + 5 = 19; (n = 1) (b) 7n + 5 = 19; in – -2) (c) 7n […]
Chapter 3 Data Handling
Chapter 3 Data Handling Very Short Answer Type Question 1. Find the range of the following data: 21, 16, 30, 15, 16, 18, 10, 24, 26, 20 Solution: Greatest number 30 Smallest number = 10 Range = 30 – 10 = 20 Question 2. Find the mode of the following data: 24, 26, 23, 26, […]
Chapter 3 Data Handling Exercise 3.4
Chapter 3 Data Handling Exercise 3.4 Question 1. Tell whether the following situations are certain to happen, impossible to happen, can happen but not certain. (i) You are older today than yesterday. (ii) A tossed coin will land heads up. (iii) A dice when tossed shall land up with 8 on top. (iv) The next […]
Chapter 3 Data Handling Exercise 3.3
Chapter 3 Data Handling Exercise 3.3 Question 1. Use the bar graph to answer the following questions. (a) Which is the most popular pet? (b) How many students have dog as a pet? Solution: From the given bar graph in figure, we have (a) Cats are the most popular pet among the students. (b) 8 […]
Chapter 3 Data Handling Exercise 3.2
Chapter 3 Data Handling Exercise 3.2 Question 2. The runs scored in a cricket match by 11 players is as follows: 6, 15, 120, 50, 100, 80, 10, 15, 8, 10, 15 Find the mean, mode and median of this data. Are the three same? Solution: Given data: 6, 15, 120, 50, 100, 80, 10, […]