Page 392 - Start Up Mathematics_8 (Non CCE)

3. 2 6 1 5
8.
× 4 3 9
2 3 5 3 5
7 8 4 5 X

1 0 4 6 0 X X
1 1 4 7 9 8 5
Exemplar Problems
1. a 2. 3; 6 3. False 4. 9
5. 12 6. (a) A = 8, B = 9
9. (b) A = 7, B = 2, C = 3, D = 1
7. 2 8. S = 6, M = 9, B = 1, U = 0

Chapter 20
Exercise 20.1
Problems Related to Thinking Skills 2. (b) 30 (c) 2 (d) 28 (e) 7 (f) 6
1. 5 1 3 2. 4 3. (a) 3 (b) 12 (c) 6
4 2 6 6. (a) 25.6 mm (b) 2
8 7 9 Exercise 20.2
3. The required three-digit number is 13 × 13 = 169. 1. (a) 50 (b) 5 (c) 60 (d) 47.5 and 57.5 (e) 5
Exercise 20.3
Review Exercises
1. (a) This bar graph gives the information about the marks
Multiple Choice Questions obtained by a student in two consecutive years namely
1. a 2. b 3. a 4. c 5. d 2006–2007 and 2007–2008 in various subjects.
Solve Mentally (b) Maths (c) English (d) Hindi (e) 5
True or False 4. (a) 210 (b) Bus (c) Scooter (d) 5 : 8 (e) 60%
1. True 2. True 3. False 4. False 5. False Review Exercises
Answer in One Word or a Line Multiple Choice Questions
1. 9(a – c) 1. b 2. c 3. d 4. a 5. d 6. a
2. A 3-digit number 100a + 10b + c is divisible by 6 if c is Solve Mentally
0, 2, 4, 6 or 8 and a + b + c is divisible by 3. True or False
3. No, because 9 + 5 = 14, which is not divisible by 3.
4. 675 and 720 1. False 2. True 3. False 4. False 5. True
Let’s Evaluate Fill in the Blanks
1. tally, frequencies 2. inclusive, exclusive
1. x = 4 2. y = 2 3. x = 5
3. minimum, maximum 4. vertically, horizontally
Thinking Skills
Answer in One Word or a Line
1. A = 8, B = 6, C = 4, D = 4, E = 5, F = 6, G = 3 and H = 6 1. (a) A collection of information is known as raw data.
2. (b) Frequency is defined as the number of times a
particular observation occurs in a data.
(c) The data which can take only whole number values
is called discrete data.
(d) The data which can take any value between two
whole numbers is called continuous data.
(e) The difference between the upper limit and the lower
limit of the class interval is known as class size.
(f) The difference between the greatest and the smallest
values in the set of observations is called the
range.

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