Page 218 - Maths Class 06

5. (a) 100800 (b) 359680 (c) 572 3 3 7 7 7
(c) 9520 (d) 17425000 (d) 1586 3 7 7 7 7
6. Do it yourself 7. Do it yourself
8. Do it yourself 9. Do it yourself (e) 4995 7 7 7 3 7
10. (a) 36 (b) 36 (f) 94505 7 7 7 3 7
11. Do it yourself (g) 66660 3 3 7 3 3
12. (a) 24 (b) 24
(h) 639210 3 7 7 3 3
13. Do it yourself 14. 99899
15. ` 3100 (i) 726352 3 3 3 7 7
EXERCISE 2.3 2.

1. (a) 37 ´ 15 = 555; 37 ´ 18 = 666 Number 3 6 9 11
(b) 1 + 2 + 3 + 4 + 5 + 6 = 21;
1 + 2 + 3 + 4 + 5 + 6 + 7 = 28 (a) 2580 3 3 7 7
(c) 46 ´ 99999 = 4600000 – 46; (b) 5335 7 7 7 3
46 ´ 999999 = 46000000 – 46;
(d) 9 ´ 98765 + 3 = 888888; (c) 71232 3 3 7 7
9 ´ 987654 + 2 = 8888888
(d) 10824 3 3 7 3
MCQs
(e) 21084 3 3 7 7
1. (a), 2. (c), 3. (a), 4. (d), 5. (b), 6. (a), 7. (a), 8. (a),
9. (b), 10. (b), 11. (b), 12. (a). (f) 639216 3 3 3 7
EXERCISE 3.1 (g) 901351 7 7 7 3
1. (a) 1, 3, 9, 27 3 3 7 3
(b) 1, 2, 4, 19, 38, 76 (h) 1790184
(c) 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 30, 40, 60, 120 (i) 10000001 7 7 7 3
2. (a) 1, 5 (b) 1, 2, 4 (c) 1, 7
(d) 1, 3 (e) 1, 2, 4 (f) 1, 3, 5, 15 3. No 4. Yes, 938 5. No, 12
3. (a) 5, 10, 15, 20 6. 2, 3, 4, 6, 10 7. 1, 2, 3, 4, 6
(b) 13, 26, 39, 52 EXERCISE 3.3
(c) 17, 34, 51, 68
1. (a) 90 (b) 84 (c) 180
4. (a) 18, 36, 54
(b) 50, 100, 150 2 2 2
(c) 24, 48, 72 5. 30, 60 45 42 90
5. 30 and 60
3 2 2
6. (a) 2, 3, 5, 7, 11, 13, 17, 19
(b) 29, 31, 37, 41, 43 15 21 45
(c) 97, 101, 103, 107, 109, 111, 113 3 3 3
7. Do it yourself 5 7 15
8. 42, 44, 46, 48, 50, 52, 54, 56, 58 3
9. 1, 3, 5, 7, 9, 11, 13, 15, 17, 19
5
10. 1, 3 and 5
11. 40 2. (a) 2 ´ 2 7´ (b) 2 ´ 3 ´ 3 ´
3
12. (a) Prime, composite (b) Factor, multiple (c) 2 ´ 2 ´ 3 ´ (d) 2 ´ 2 ´ 2 ´
3
3
(c) Prime number (d) Composite (e) 2 ´ 2 ´ 2 ´ 3 ´
5
(e) 4 (f) 2 (g) 2 (f) 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2
EXERCISE 3.2 (g) 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 3 (h) 2 ´ 2 ´ 3 ´ 3 ´ 5
(i) 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2 ´ 2
1.
(j) 2 ´ 2 ´ 2 ´ 5 ´ 5 11´
Number 2 4 8 5 10
(k) 2 ´ 3 ´ 3 ´ 5 7´ (l) 2 ´ 2 ´ 3 ´ 3 13´
(a) 990 3 7 7 3 3 3. 7 ´ 13 19´
´
´
(b) 464 3 3 3 7 7 4. 1000 = 2 ´ 2 ´ 2 ´ 5 ´ 5 ´ 5, 9999 = 3 ´ 3 11 101
Mathematics-6 218