Page 237 - ICSE Math 5

(e) 10.
0 1 2 3 4 5 6 7 8 9 –1 0 1 23 4 5 67 8 9 10
So, 3 + 5 = 8
So, 2 – (–6) = 8
4. (a) 4 (b) –17 (c) –11 (d) –95 (e) 0 (f) 25
11. (a) –10 (b) 10 (c) –43 (d) 9
Exercise 8.4
Values and Life Skills
4,500 m
1. (a)
–15 –14 –13 –12 –11 –10 –9 –8 –7
So, –8 – (5) = –13 Progress Worksheet
1. (a) G (b) posi ve integer (c) –7; 10 (d) E
(b) 2. (a) True (b) True
0 1 2 3 4 5 6 7 8 9 10 11
So, 10 – 9 = 1 (c) False; The greatest nega ve integer is –1.
(d) False; An integer that is neither posi ve nor
(c) nega ve is 0.
–1 0 1 2 3 4 5 6 7 3. (a) (iii) (b) (ii) (c) (i) (d) (iv)
So, 0 – (–6) = 6
4. Integer Predecessor Successor
(d) (a) –7 –8 –6
–9 –8 –7 –6 –5 –4 –3 –2 –1 0 1
So, –8 – (–6) = –2 (b) –6 –7 –5
2. (a) 20 (b) 40 (c) –3 (d) –21 (c) 8 7 9
3. (a) –11 (b) 70 (c) 50 (d) –9 (d) –4 –5 –3
Review Exercise A B C D E
5.
A B C D E –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10
1.
–10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7
6. (a) ; 3
2. (a) D (b) posi ve integer –5 –4 –3 –2 –1 0 1 2 3 4 5
(c) 2 and –9 respec vely (d) E (b) ; –5
(e) E < D < A < C < B < F (f) F –6 –5 –4 –3 –2 –1 0 1 2 3 4
(c) Le
3. +30°C; –3°C; +26°C; –5°C; +35°C
Ahmedabad 7. –98 < –15 < –13 < 0 < 16
Srinagar Shimla Bengaluru Delhi
–25 –20 –15 –10 –5 0 5 10 15 20 25 30 35 40 Chapter 9: Geometry
4. Integer Predecessor Successor Exercise 9.1
(a) –2 –3 –1 1. (a) ABC (b) XYZ (c) DEF
(b) –5 –6 –4 2. (a) Acute angle (b) Acute angle
(c) 8 7 9 (c) Obtuse angle (d) Straight angle
(d) –1 –2 0 (e) Right angle (f) Acute angle
3. (a) 70° (b) 30° (c) 90° (d) 110° (e) 130° (f) 75°
5. (a) False; On a number line, 0 is to the le of 4.
4. Students to do on their own.
(b) True (c) True (d) True
(e) False; Nega ve numbers are usually wri en using a 5. (a) 30° (b) 50° (c) 80°
‘–’ sign before the number. (d) 20° (e) 180° (f) 160°
6. (a) (iii) (b) (ii) (c) (ii) (d) (iv) Exercise 9.2
1. (b) and (c)
7. (a) ; 0
–10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2. (a) (b)
(b) ; –3
–5 –4 –3 –2 –1 0 1 2 3 4
(c) le
8. Ascending order = –98 < –20 < –12 < 0 < 26
Descending order = 26 > 0 > –12 > –20 > –98 (c) (d)

9.
–7 –6 –5 –4 –3 –2 –1 0
So, –3 + (–3) = –6
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