Chapter 16 Playing with Numbers

Chapter 16 Playing with Numbers Very Short Answer Type Question 1. Write the following numbers in generalised form. (a) ab (b) 85 (c) 132 (d) 1000 Solution: (a) ab = 10 × a + 1 × b = 10a + b (b) 85 = 10 × 8 + 1 × 5 = 10 × 8 + 5 (c) 132 = 100 × 1 + 10 × 3 + 1 × 2 = 100...

Chapter 16 Playing with Numbers Exercise 16.2

Chapter 16 Playing with Numbers Exercise 16.2 Question 1. If 21y5 is a multiple of 9, where y is a digit, what is the value of y? Solution: A number is divisible by 9 if the sum of its digits is also divisible by 9. Sum of the digits of 21y5 = 2 + 1 +y + 5 = 8 + y (8...

Chapter 16 Playing with Numbers Exercise 16.1

Chapter 16 Playing with Numbers Exercise 16.1 Find the values of the letters in each of the following and give reasons for the steps involved. Question 1. Solution: Question 2. Solution: Question 3. Solution: Question 4. Solution: Question 5. Solution: 3 × B = B ⇒ B =...

Chapter 15 Introduction to Graphs

Chapter 15 Introduction to Graphs Question 1. Write the coordinates of each point shown is the graph. Solution: Question 2. From the given figure, choose the letters indicate the location of the points. (i) (3, 1) (ii) (0, 5) (iii) (3, 0) (iv) (1, 2) (v) (2, 3) (vi)...

Chapter 15 Introduction to Graphs Exercise 15.3

Chapter 15 Introduction to Graphs Exercise 15.3 Question 1. Draw the graphs for the following tables of values, with suitable scales on the axes. (a) Cost of apples (b) Distance travelled by car. (i) How much distance did the car cover during the period 7:30 am to 8...
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