Page 228 - Maths Skills - 7

226 Maths

4. equation 5. Transposing C. 1. T 2. T 3. F 4. T 5. T
D. 1. Won matches = 6; Lost matches = 4 2. 1440 points E. 1. (a) 2. (c) 3. (a)
F. 1. 3 2. 9 3. 167 trees 4. 8 years 5. 6 marbles
G. x = 9 y = 7 p = 5 z = 3
HOTS

1. 18 TV sets 2. Science : 6 days, Mathematics : 13 days
2 x + 20
3. (i) 6 s (ii) s (iii) x = 20 m
3 6

Assessment - 1
−1
1. (a) 2. (c) 3. (b) 4. (c) 5. (c) 6. 0 7. 8. 0.7915
11
9. 6 10. one 11. (F) 12. (F) 13. (T) 14. (T) 15. (F) 16. –31 feet
17. 93 feet 18. –81 feet 19. (a) 20. (b) 21. Do yourself 22. 8 pm, –14°C 23. 19882 m 24. –12
7 4 8 6 1 1 18
25. Green Red Blue Yellow 26. (i) (ii) 27.
25 25 25 25 14 5 23
28. Riddhi = 1 year Aarav = 6 year.

Chapter - 4: Rational Numbers
Boot-up
A. 1. (ii) 2. (ii) 3. (i) 4. (i) B. 1. not defined 2. 1 and –1 3. 0 4. 1
C. 1. T 2. T 3. F 4. F
Exercise - 4.1
1. (i) numerator = – 148, denominator = – 249 (ii) numerator = 7, denominator = 13
(iii) numerator = – 3, denominator = 13 (iv) numerator = 2, denominator = – 29
2. (i) negative (ii) positive (iii) positive (iv) negative

3 21 27 5 35 70
3. (i) = = (ii) = =
− 11 − 77 − 99 13 91 182
147 −8 13 −39 8 18 47 47
4. (i) (ii) (iii) (iv) 5. (i) (ii) (iii) (iv)
189 21 27 59 − 13 29 35 − 38
15 −30 −27 9 16 −24 40 −64
6. (i) (ii) (iii) (iv) 7. (i) (ii) (iii) (iv)
− 35 70 63 − 21 − 26 39 − 65 104
2 8 4 −12 −105 −35 70 −28
8. (i) (ii) (iii) (iv) 9. (i) (ii) (iii) (iv)
− 10 − 40 − 20 60 180 60 − 120 48
−1 −19 1 1 −8 −5 5 21 −3 −6 −4 −6
10. (i) (ii) (iii) (iv) 11. (i) ≠ (ii) ≠ (iii) = (iv) =
2 28 3 4 −13 16 − 7 − 15 8 16 −12 −18
12. (i) – 42 (ii) 7 (iii) – 560 (iv) – 34
Exercise - 4.2

7 4 − 5 7 4 −8 5 −9
1. Do it yourself. 2. (i) 0 (ii) (iii) (iv) (v) 3. (i) (ii) (iii) (iv)
8 7 13 19 − 9 −21 − 6 14
3 − 3 4 7 13 − 4 − 3 8
4. (i) = (ii) < (iii) > (iv) > 5. (i) < < < (ii) < < <
− 5 14 7 10 − 21 9 7 15
5 1 13 − 15 17 13 1 − 3
6. (i) > > > (ii) > > > 7. Do it yourself. 8. Do it yourself.
8 6 − 16 12 15 20 − 5 10
Exercise - 4.3
8 −2 −14 −1 113 97 1 17
1. (i) (ii) (iii) (iv) 2. (i) (ii) (iii) (iv)
7 5 11 2 24 39 54 30
−25 −11 3 220 −87 −29 70 15 5 −95
3. (i) (ii) (iii) (iv) (v) or (vi) (vii) or (viii)
24 7 5 27 27 9 13 12 4 126