Page 289 - ICSE Math 6

Chapter 10 8. (a), (b), (e) and (h)

Exercise 9. (a) 1 (b) 3 (c) 7 (d) 21 (e) 7 (f) 4
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1. 66 km h 2. 133 km 3. 31 h Mental Maths
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4. (a) 10 m s (b) 12,000 m (or 12 km) (c) 87.5 s 1. (a) False (b) True (c) False (d) False
2
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5. 46 km h 6. 9.2 km (e) True (f) False
13
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7. (a) 125 m s (b) 4,000 cm s (c) 126 km h –1 2. (a) variable (b) an algebraic expression (c) 8
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(d) 27 km h (e) 20.4 km min (f) 17,000 m min –1 (d) –10 (e) unlike
Practice Time
Mental Maths –7 –2
2
2
1. (a) True (b) False (c) True (d) True 1. Constants: 11, 0 and 9 ; Literals: a b, x y, –7a and 3 x
2
2. (a) variable (b) 10 (c) 240 (d) 120; 2 (e) 30 2. (a) 7y and –2y; –2x and 7x 2
2
2
2
2
(b) ab and 11 ab ; a b and 7a b
Practice Time 13
7
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1. 2,250 cm s (b) 990 km h –1 (c) 2pq and pq
2. 33,000 m 3. 3 min 4. 7 h 5. 56 km h –1 2 9
6. (a) 8 km (b) 40 km 7. 250 m 8. 64 km h –1 (d) 2y and 13 y; –3z and –4z
9. (a) 105 km (b) 6 h 20 min (c) 750 m min –1 3. Monomial: (a), (b), (f) and (h)
5
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10. 38 m s 11. (a) m s (b) 3 km h –1 Binomial: (d) and (g)
6 Trinomial: (c) and (e)
Think Smart 4. (a) Yes; 5 (b) y , 3y , y and 11
2
3 –7 5
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1. 75 km h 2. (i) Ali (ii) 1.25 m s –1 10
2
(c) Coefficient of y : 1
Chapter 11 Coefficient of y : 3
3
5 –7
Exercise 11.1 Coefficient of y : 10
–1 xz (d) 11
1. Constants:10 and 3 ; Variable: ab, –2x and 2 5. (a) No (b) Yes; 2 (c) Yes; 4 (d) No
2. n; ` (5n) 3. n; 4n 4. n; 2n 5. n 2 (e) Yes, 4 (f) No
6. 100; 62; 149; 555; 895 7. 5n 8. 12n 6. 500 n 7. 95 h
Exercise 11.2 Think Smart
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1. (a) 3; 2; 3 (b) 1; 11 ; 5 1. Number of televisions
3 –2 2. (a) 10m × n ÷ p (b) 10m + n × p (c) 10m + n – p
2. (a) 2a, a and a; 3b and –6b
5 3 (Answers may vary)
2
(b) 4xy and –14yx; –4y, 11 y Chapter 12
3
3
2 1 2
(c) 3b and – 3 b ; 6a , a Exercise 12.1
5
7
2
2
2
2
2
(d) x y and 3 x y; 2y x and –4y x 1. (a) 16x (b) 32 a (c) –8pq (d) 8x –10y 2
11 3
2 2
3. (a) 56xy, –7xy (b) a , a 2 (e) x + y (f) 48 pq
2
5 2
3
2
(c) 16x , –13x and 12y, –7y (d) mn, nm 6 5 –11 2
2
4. Yes, as both are constant terms. 2. (a) q (b) –16x (c) –15a (d) 3yz – 2xq (e) 14 x y
2 2 2
3
2
3
5. (a) 3a b, 4a , b and – 7 (b) 4 (f) –17a b c
10 3. (a) –7m + 8m 2 (b) –26xy (c) 0
3
(c) Coefficient of a : 4 –25 2
2
3
Coefficient of b : 1 4. 2 x yz 5. 5x y – 32xy
2
Coefficient of a : 3b Exercise 12.2
5 2
9 9
2
(d) – 7 1. (a) 12a (b) –4x (c) x y (d) 5x y (e) –a – b
10
6. Monomial: (b), (g) and (h); Binomial: (a), (d) and (e); (f) 2 + a – b (g) 8 – a (h) x – 1
2
3
Trinomial: (c) and (f) 2. (a) 99a (b) 205xy (c) 0 (d) 16abxy (e) –8x ab
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2
2
3
7. (a) (b) 17b (c) x (d) 1 (f) 15ax y (g) xy 4
5 11 7
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