Page 352 - Start Up Mathematics_7

Thinking Skills (iii) (proper fraction) (iv) (proper fraction)
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1. (a) Colour any 3 sectors red 7 9 6
(b) Colour any 4 sectors blue (v) 12 (proper fraction) (vi) 8 (whole number)
(c) Colour any 1 sector green (vii) 11 (whole number)
(d) Colour remaining 2 sectors yellow Chapter 3
3 4 6 1
2. (a) (b) (c) (d) (e) 1 (f) 0 1. (i) 0.5 (ii) 0.7 (iii) 7 (iv) 1.49 (v) 2.30 (vi) 0.88
13 13 13 13
2. (i) Ones (ii) Hundredths (iii) Tenths
3. (a) 1 (b) 1 (c) 1 (d) 1 (iv) Hundredths (v) Thousandths
9 4 2 2 3. Ayub travelled more by 0.9 km or 900 m
4. The probabilities will be half of that are in Q. 3 above. 4. 14.6 km 5. 553 km
5. (i) c (ii) e (iii) a (iv) b (v) d 6. (i) 2 (ii) 180 (iii) 6.5 (iv) 44.2 (v) 2 (vi) 31
(vii) 510 (viii) 27 (ix) 2.1
Values and Life Skills
7. 18 km
Fair to both : (a), (b), (c) and (e)
Chapter 4
Exemplar Problems
1. (a), (c), (d), (e)
1. d 2. b 3. 1 4. 6
2. (a) < (b) < (c) = (d) > (e) < (f) = (g) >
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5. False 6. False 7. 3. (a) (b) –5 (c) 2 (d) (e) –3 2
6 2 6 –3 4 7
2 1 –63 –27 –54 –6 6
8. (a) 1 (b) (c) (d) 0 4. (a) (b) (c) (d) (e) (f) 1
5 5 8 10 55 35 55
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Some NCERT Textbook Questions 5. (a) –6 (b) –3 (c) 15 (d) –1 (e) –14
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Chapter 1 (f) 91 (g) –15
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1. (a) < (b) < (c) > (d) < (e) > Chapter 5
2. One such pair could be: 4 5 8 100 10
(a) –2, –10; [–2 – (–10) = 8] (b) –6, 1(–6 + 1 = 5) 1. (a) 3 (b) 3 (c) 2 (d) 2 (e) 2 4 2 2
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(c) –1, 2; (–1 – 2 = –3) 2. (a) 2 × 3 (b) 5 × 3 (c) 2 × 3 × 5 (d) 2 × 3 × 5
3. Scores of both the teams are same, i.e., –30; Yes 3. (a) 2000 (b) 196 (c) 40 (d) 768 (e) 0 (f) 675
4. Students to do one their own. (g) 144 (h) 90000
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5. (a) Loss of ` 1000 (b) 4000 bags 4. (a) 3 (b) 5 (c) 5 (d) 7 × 11 (e) 3 or 1 (f) 3
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6. (–6, 2), (–12, 4), (12, –4), (9, –3), (–9 ,3) (there could be (g) 1 (h) 2 (i) (2a) (j) a (k) a b (l) 2 8
many such pairs) 5. (a) False; 10 × 10 = 10 and (100) = 10
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7. 9 p.m., –14°C (b) False; 2 = 8, 5 = 25 (c) False; 6 = 2 × 3
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Chapter 2 (d) True; 3 = 1, (1000) = 1
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1. Yes 2. 3 cm 6. (a) 86045 (b) 405302 (c) 30705 (d) 900230
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3. (i) (d) (ii) (b) (iii) (a) (iv) (c) Chapter 6
4. One way of doing this is: 1. (a) x + 2xy – y (b) 5a + b – 6
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(a) (b) (c)
2. 4x – 3y – xy
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3. (a) –y + 11 (b) 2x + 4
4. (a) 0 (b) 1 (c) –1 (d) 1 (e) 1
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5. (i) 2 litres (ii) 6. 2 m 7. 44 km 5. (a) 5x – 13; –3 (b) 8x – 1; 15 (c) 11x – 10; 12
(d) 11x +7; 29
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8. (i) (improper fraction) (ii) (improper fraction) 6. (a) 1000 (b) 20
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