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Answers

Chapter 1: Integers 4. (a) 1 (b) –90 (c) 2 (d) 0.5
Let’s Recall 5. –144 6. –24
1. –1, 0, –9 (Answer may vary) 2. (–3) + 4 + (–6) 7. (a) At midnight (b) –6 °C
3. –4, 1 (Answer may vary) 4. 2760 m 8. (a) 12 (b) 22 9. (a) 480 (b) 960
5. (a) (–7) (b) (–18) (c) (–9) Practice Time 1D
Think and Answer 1. 0 2. –26 3. –16 4. 28
1. 1 2. –1 5. 15 6. 7 7. –1 8. 24
Quick Check Maths Connect
(a) –13 (b) 24 (c) –1 (d) 8 (e) 0 (a) 0 (b) +4 (c) –8
Life Skills Mental Maths
Roma scored 5 marks more than Ruhi. 1. 6 2. –2
Practice Time 1A Chapter Assessment
1. (a) – 17 (b) 8 (c) 78 (d) 100 A. 1. (b) 2. (b) 3. (c) 4. (c)
2. (a) –17, –13, –7, 3, 11, 15 (b) –15, –10, –9, –1, 0, 2, 12 5.
3. (a) 51, 10, –2, –6, –15, –27, –35 (b) –59, –70, –79, –84, –100 (d) 6. (b)
5. (a) > (b) < (c) > B. 1. (d) 2. (b)
6. (a) –1, –8 (b) –10, 1 (c) –3, 1 C. (a) - (vi) (b) - (iii) (c) - (v) (d) - (vii) (e) - (viii)
(Answers may vary) (f) - (iv) (g) - (ii) (h) - (ix) (i) - (i)
7. –34 8. –155 D. 1. y, x, z, 2. a 3. 12, 5 4. –4 5. 40
9. (a) 0, Existence of Additive inverse E. 1. (a) –240 (b) –3 (c) –26 (d) 0 (e) 500
(b) –18, Existence of Additive inverse 2. (a) 19 (b) 13 3. 5, –3 4. 39 seconds
(c) –7, commutative property (d) (–28), Associative property 5. 260°C 7. 20 bees decreases per day
(e) 0, Additive identity 8. 23 January 9. 17 m
10. 47,000 ft 11. `1450 12. 12 Brain Sizzlers
Quick Check Imran – 10:01 p.m., Ruhi – 10:01 p.m., Roma – 10:03 p.m.,
x –3 –2 –1 0 1 2 3 Sumit – 10:06 p.m., Sonam – 10:10 p.m.
–3 9 6 3 0 –3 –6 –9
–2 6 4 2 0 –2 –4 –6 Chapter 2: Fractions and Decimals
–1 3 2 1 0 –1 –2 –3 Let’s Recall
0 0 0 0 0 0 0 0
1 –3 –2 –1 0 1 2 3 1. (a) Improper fraction, simplest form (b) Improper fraction, simplest form
2 –6 –4 –2 0 2 4 6 (c) Mixed fraction, in simplest form (d) Proper fraction
3 –9 –6 –3 0 3 6 9 (e) Mixed fraction (f) Proper fraction, simplest form
(a) (–2) × 3 = –6 (b) 3 × (–3) = –9 (g) Proper fraction, simplest form
Quick Check 2. 5 3 2 7
,, ,
(a) –1 (b) 1 12 5 3 10
Think and Answer 8 2 1 9 7 55 17
,
(c) (–3) × (–3) × (–3) × (–3) × (–3) 3. (a) 5 5 (b) 11 1 , 11 (c) 3 112 7 , 112 4. 180
Quick Check Practice Time 2A
(a) Distributive property of multiplication over subtraction 1 8 2 1
(b) Associative property (c) Multiplication by 0 1. (a) 4 7 (b) 2 13 (c) 9 9 (d) 2 50
(d) Multiplicative identify
Practice Time 1B 2. (a) 45 (b) 78 (c) 49 (d) 65
1. (a) 77 (b) –132 (c) –9 (d) 428 7 7 11 9
2. (a) 128 (b) –221 (c) –399 (d) 980 6 9 12 4 8 16 22 33 44
,
,
,
,
,
,
(e) –13,200 (f) 120 3. (a) 8 12 16 (b) 7 14 28 (c) 28 42 56
3. (a) 1 (b) 1 (c) –1 (d) 1
4. (a) 0 (b) –1 (c) –23 (d) –11 (d) 28 42 56
,
,
(e) 103 (f) (–2) 50 75 100
5. (a) –5075 (b) –1716 (c) –4 (d) 1200 21 2 3 4
(e) 436 (f) 2,11,970 4. (a) (b) (c) (d)
7. (a) –ve (b) +ve (c) +ve (d) –ve 49 5 7 6
8. 0 9. Loss of `3000 5. 21 11
10. 2°C, 20°C to 25°C or 68 °F to 77 °F (a) 18 (b) 35
Life Skills 3 6 5 11 7 3 1 5
<
504 feet 6. (a) (i) 42 21 < < (ii) 48 << <
7 14
8
2 6
Practice Time 1C 11 16 13 5 2 5 3 1
1. (a) –4 (b) –7 (c) 8 (d) 5 (e) –1 (b) (i) > > > (ii) > > >
2. (a) –17 (b) –2 (c) –29 (d) 0 (e) –12 10 21 35 14 3 16 18 12
(f) –20 (g) –225 7. 11 1 7 (d) 1 77
5
3. (a) –101 (b) –34 (c) –81 (d) –16 (a) 6 12 (b) 6 18 (c) 2 40 6 (e) 4 144
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