Page 199 - Math Skill - 5

Answers 197

3. Predecessor Number Successor Predecessor Number Successor
(a) 27,309 27,310 27,311 (d) 41,656 41,657 41,658
(b) 14,699 14,700 14,701 (e) 70,005 70,006 70,007
(c) 28,997 28,998 28,999

Exercise 1.5
1. (a) < (b) > (c) > (d) < (e) = (f) > 2. (a) 15,39,128 (b) 31,20,567
3. (a) 53,34,52,159 < 72,78,35,218 < 73,61,76,128 < 76,61,52,831 (b) 18,87,359 < 61,52,893 < 67,89,389 < 78,15,289
(c) 78,728 < 85,125 < 6,52,361 < 55,23,620
4. (a) 79,62,387 > 68,78,599 > 61,83,955 > 38,69,890 (b) 79,38,596 > 78,38,518 > 67,83,897 > 61,83,968
(c) 60,69,35,215 > 58,78,38,691 > 57,98,32,891 > 56,96,38,356

Exercise 1.6
1. (a) 1,02,356 (b) 1,23,459 (c) 20,356 (d) 1,67,889 (e) 1,02,368 (f) 2,45,789
2. (a) 90000 (b) 90000000 (c) 9000000
Assessment Time

A. 1. (a) 2. (b) 3. (b) 4. (b) 5. (b) B. 1. Ten lakh 2. 9,99,999 3. 8,04,211
4. 7,00,000 5. 1,03,456 6. 100458 C. 1. 3006789 2. 9987630
3. 30,00,000 + 6000 + 700 + 80 + 9; 90,00,000 + 9,00,000 + 80,000 + 7000 + 600 + 30 4. 999987630 D. 1. (c) 6. 1. (a)

CHAPTER - 2: ROMAN NUMERALS

Boot-up 1. CVI = 106 2. XCV = 95 3. LXI = 61 4. XCI = 91
Exercise 2.1

1. (a) LXXXIII (b) CLXXXVII (c) CCCXLIX (d) CCXLVIII (e) CCLXXIV
(f) CCCVII (g) CDXCVII (h) CLXXVII 2. (a) 169 (b) 246
(c) 427 (d) 313 (e) 91 (f) 404
3. (a) < (b) > (c) < (d) < (e) < (f) > 4. (a) XXI (b) LXXXIII (c) XXXIV
(d) XXIV (e) LXXXIX (f) IX (g) XXXII (h) XLVII 5. (b), (c), (e), (f), (g)
Assessment Time

A. 1. (a) 2. (c) 3. (b) 4. (b) 5. (a) B. 1. D, M 2. V, L, D 3. L, C
C. 1. 2753 2. 1258 3. CDXIII D. 1. (b) 2. (b)
CHAPTER - 3: THE FOUR FUNDAMENTAL OPERATIONS

Boot-up 1. 3920 2. 2000 – 1920 = 80 3. 35 × 8 = 280 4. 3920 ÷ 14 = 280

Exercise 3.1
1. (a) 9,99,97,999 (b) 63,14,64,297 (c) 94,75,80,723 (d) 7,97,65,737
2. (a) 6,98,47,323 (b) 6,47,58,875 (c) 87,92,878
3. (a) (b)
1 1 0 4 8 8 2 5 1 9 7 8 0 2
+ 7 7 3 5 3 7 8 + 7 0 1 2 3 1 3

8 8 4 0 2 6 0 1 2 2 1 0 1 1 5