Page 236 - ICSE Math 5

2. (a) 51.4 (b) 772.9 (c) 8,620 (d) 7,020 Exercise 8.2
–3 –2 –1 0 1 2 3
3. (a) 0.62 < 0.64 < 2.08 (b) 0.004 < 0.026 < 0.3
1. (a)
(c) 4.014 < 40.15 < 46.114 –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 45 6 7 8 9 10
4. (a) 0.45 > 0.351 > 0.315 (b) 13.5 > 5.01 > 3.05 Integers between –4 and 4 are –3, –2, –1, 0, 1, 2
(c) 516.73 > 462.73 > 402.703 and 3.
5. (a) Place value of 9 is 9 tens, i.e., 90. –9 –8 –7 –6 –5 –4 –3 –2 –1
3 (b)
Place value of 3 is 3 thousandths, i.e., . –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10
1000 Integers between –10 and 0 are –9, –8, –7, –6, –5,
4 8 3
5,000 + 700 + 90 + 2 + + + –4, –3, –2 and –1.
10 100 1000 –8 –7 –6
(b) Place value of 1 is 1 hundred, i.e., 100. (c)
5 –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10
Place value of 5 is 5 tenths, i.e., . Integers between –9 and –5 are –8, –7 and –6.
10
5 2 5 (d) 1 and 12.
100 + 60 + 8 + + +
10 100 1000 2 3 4 5 6 7 8 9 10 11
(c) Place value of 7 is 7 tens, i.e., 70.
–2 –1 0 1 2 3 4 5 6 7 8 9 10 11 12 13
9
Place value of 9 is 9 hundredths, i.e., . Integers between 1 and 12 are 2, 3, 4, 5, 6, 7, 8, 9,
100
7 9 5 10 and 11.
400 + 70 + 5 + + +
10 100 1000 2. (a) 0 (b) –4 (c) –6 (d) –12
(d) Place value of 1 is 1 ten, i.e., 10. 3. –6, –5 and –4 4. –4, –3 and –2
3
Place value of 3 is 3 thousandths, i.e., . 5. (a) –4 < –2 < 0 < 5 < 6 (b) –20 < –10 < 1 < 10 < 15
1000 (c) –13 < – 11 < – 4 < 11 < 13
6 9 3
8,000 + 400 + 10 + 4 + + + 6. (a) 4 > 1 > –2 > –3 > –10 (b) 18 > 2 > –9 > –18 > –27
10 100 1000
(c) 17 > 14 > 9 > –10 > –16
6. (a) 1,775 (b) 708.1 (c) 3,538.486 (d) 1,339.293
7. (a) > (b) < (c) < (d) <
7. 7.7 km 8. 6 L 9. ` 101.50; ` 48.50
10. 9.25 m Exercise 8.3
Chapter 8: Introduc on to Nega ve Numbers 1. (a) ; 6
0 1 2 3 4 5 6 7
Exercise 8.1
(b) ; 0
1. (a) Deposit of ` 5,000 (b) 750 km east of Haryana –7 –6 –5 –4 –3 –2 –1 0 1
(c) At a depth of 30 m (d) 250 m above the sea level
(c) ; –8
(e) Temperature below 25°C (f) Profi t of ` 10,000 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1
2. (a) –25°C (b) +100 m (c) + ` 800 (d) ; –5
(d) +10°C (e) –30 m (f) + ` 4,585 –7 –6 –5 –4 –3 –2 –1 0 1
3. (a) (b) (a) (c) (d) 2. (a) ; –12
–17 –16 –15 –14 –13 –12 –11 –10
–10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10
4. A = 0, B = +5, C = –3, D = –10, E = –7, F = +3, G = +8, (b) ; –17
H = +10 –18 –17 –16 –15 –14 –13 –12 –11 –10 –9 –8 –7 –6
(c) Right (d) Le
(a) B, F, G and H (b) C, D and E
(c) H; D
3. (a)
5. 0 1 2 3 4 5 6 7 8 9 10 11 12
–10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10
So, 10 + (–6) = 4
Integer Predecessor Successor
(a) 1 0 2 (b)
–11 –10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0
(b) –5 –6 –4
So, (–9) + (–2) = –11
(c) –8 –9 –7
(c)
(d) 7 6 8 –7 –6 –5 –4 –3 –2 –1 0 1
(e) 0 –1 1 So, 0 + (–6) = –6
6. (a) True (b) False; –15 is smaller than –14. (d)
(c) True (d) False; 0 is an integer. –7 –6 –5 –4 –3 –2 –1 0 1
(e) True So, (–5) + 4 = –1
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