Page 229 - Maths Skills - 7

Answers 227

−23 −71 −31 −6 5 46 11 58
4. (i) (ii) (iii) (iv) 5. (i) −2 (ii) −2 (iii) −3 (iv) −4
16 60 36 5 8 55 14 75
−21 −2 18 −16 15 2 −13
6. (i) 17 (ii) (iii) (iv) (v) (vi) (vii) (viii)
9 3 7 5 7 9 38
5 169 486
7. 6 km 8. litres 9. −
28 20 35
Exercise - 4.4

3 −1 9 −1 1 −41 −10 −127
1. (i) (ii) (iii) (iv) (v) 1 2. (i) (ii) (iii)
7 6 13 2 6 51 21 255
17 −11 77 34 −9 16 1357 −16
(iv) 3. (i) (ii) (iii) (iv) 4. 5. 6.
27 26 23 9 14 7 770 3
4 1
7. Ruby covered more distances which is km. 8. Laila won the game. 9. 4 m.
15 6
Exercise - 4.5
15 −6
1. (i) False (ii) False (iii) False (iv) False (v) True (vi) True 2. (i) (ii)
28 7
1 −1 3 1
(iii) 66 (vi) – 33 (v) 9 3. (i) (ii) (iii) (iv) (v) 6
8 12 16 9
−1 −19 −5 1
4. (i) – 1 (ii) (iii) (iv) (v) – 1 (vi) – 10 (vii) (viii) 12
4 11 31 9
−1219 −20 1073 11 66 1600
5. 6. 7. sq. m 8. cm 9. cm 10. kg
136 63 36 3 7 3
Exercise - 4.6

16 24 3 2 −5 2 162 2 −4 −7 175
1. (i) − (ii) or 3 (iii) (iv) or −1 (v) or 32 (vi) 2. (i) (ii)
27 7 7 21 3 3 5 5 5 22 4
11 487 4 30 −4 7
3. 4. 5. 6. – 169 7. ` 19 8. (i) (ii) (iii)
12 217 3 7 27 8
3 −9 49
(iv) (v) (vi)
2 19 9
Assessment Time

A. 1. (ii) 2. (ii) 3. (i) 4. (i) 5. (ii) 6. (ii) 7. (iii) 8. (iii)
9. (iii) 10. (iii) B. 1. rational 2. fraction 3. denominator, numerator 4. zero
5. rational number 6. rational number 7. rational number 8. rational number
9. 0 C. 1. F 2. T 3. T 4. F 5. T 6. F 7. F
8. T 9. T D. 1. ` 162500 2. 32500 3. ` 1,30,000 4. 1,20,000 E. 1. (a) 2. (c)
F. 1. Yes 2. 10 3. 35 4. 4
38 3
G. 1. Australia < Europe < Antarctica < South America < Africa < Asia < North America
2. Africa : 29.6 million sq km Antarctica : 13.32 million sq. km
Asia : 44.4 million sq. km Australia : 8.14 million sq. km
Europe : 10.36 million sq. km North America : 48.84 million sq. km
South America : 17.76 million sq. km
3. 40.7 million sq. km.
HOTS

12 4 4 1
1. 2. < (true) 3. Do it yourself. 4. 1 kg
15 15 5 10