Page 294 - ICSE Math 6

Mental Maths
1. (a) False (b) False (c) True (d) False (e) False
2. (a) Yes (b) Yes (c) No (d) Yes (e) No (f) Yes 6. 7. 8. DECK
3. (a) No (b) No (c) Yes (d) Yes (e) Yes (f) No
X R
Practice Time
5.8 cm
9. 8 cm 10.
1. (a) (b) (c) P Q
Y 8 cm Z 5.8 cm

A
(d) (e) (f) 11. P 6 cm Q 12. (a) l

B

2. (a) (b) (c) A l
(b) (c)
B A B
l
13. Glass A should be selected as it is symmetric along
(d) Not possible (e) (f) Not possible
the dotted line. Glass B should be rejected as is it
nonsymmetric along the dotted line.
14. (b), (c) and (d)

3. (a) ; 1 (b) ; 1 (c) ; 1 Think Smart
1. Hexagon 2. 3. No

(d) ; 2 (e) ; 4
Chapter 21
Exercise 21.1
1. (a) 24 cm (b) 15 cm (c) 32 cm (d) 16 m
(f) ; 2 4. All of them.
(e) 16 m (f) 24 cm
2. 72 m 3. 48 m; ` 528 4. (a) 28 cm (b) 20 m
5. 108 cm 6. ` 3,960 7. Rohan 8. 31 m
5. Letter Letter with line(s) of Number of line(s)
symmetry of symmetry 9. (a) 24 cm (b) 7.2 m (c) 33 cm 10. 720 m
11. 16 m 12. 110 m
C C 1 Exercise 21.2 2 2 2
1. (a) 289 m (b) 56.25 cm (c) 30.25 m
(d) 196 cm 2
F Not possible 0 2. (a) 42 cm (b) 29.25 m 2 3. 12 cm 4. 15 cm 2
2
2
2
5. 13 cm 6. 119 m 7. ` 1,092 8. (a) 64 cm (b) 96 m
2
2
2
X X 2 9. (a) 108 cm (b) 56 m 10. 22.14 m ; ` 7,195.5
11. Area becomes 4 times 12. (a) 480 tiles (b) 64 tiles
Y Y 1 Mental Maths Breadth Perimeter Area
1. (a) False (b) False (c) True (d) True (e) False
2. (a)
Length
5 cm
Z Not possible 0 10 m 6 cm 22 cm 30 cm 2 2
70 m
34 m
7 m
6 cm 4 cm 20 cm 24 cm 2

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