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Answers

Chapter 1. Large Numbers Practice Time 1D
Let’s Recall 1. Digits Greatest number Smallest number
1. (a) Four thousand three hundred seventy-nine (a) 2,7,3,5,1 75321 12357
(b) Eight thousand nine hundred
(c) Seven thousand one hundred fifty-nine (b) 7,5,4,8,0 87540 40578
(d) Nine thousand nine hundred ninety-nine (c) 9,8,3,0,2,6 986320 203689
2. (a) 3720 (b) 5862 (c) 8088 (d) 5009 (d) 0,1,9,6,3,7 976310 103679
3. (a) 300 (b) 0 (c) 6688 (d) 6,6,7,4 (e) 6236
Practice Time 1A 2. Digits Greatest 5-digit number Smallest 5-digit number
1. Lakhs (L) Ten Thousand Thousands Hundreds Tens Ones (O) (a) 5, 8, 3, 4 88543 33458
(100000) (TTh) (10000) (Th) (1000) (H) (100) (T) (10) (1) (b) 6,0,7 77760 60007
(a) 3 7 0 3 6 (c) 2,7,8 88872 22278
(d) 9,6,0 99960 60009
(b) 4 3 6 4 5
(e) 5,0 55550 50000
(c) 3 8 6 4 4 9
3. Digits Greatest 6-digit number Smallest 6-digit number
(d) 6 4 0 3 9 6
2. (a) 36413 (b) 43098 (c) 490223 (d) 704089 (a) 1,9,7,5,0 997510 101579
3. (a) 32,064; Thirty-two thousand sixty-four (b) 2,4,6,8 888642 222468
(b) 36,379; Thirty-six thousand three hundred seventy-nine (c) 3,7,0,9 999730 300079
(c) 94,008; Ninety-four thousand eight (d) 6,8,9 999986 666689
(d) 27,114; Twenty-seven thousand one hundred fourteen
(e) 4,13,066; Four lakh thirteen thousand sixty-six (e) 4,7 777774 444447
(f) 7,36,395; Seven lakh thirty-six thousand three hundred ninety-five Practice Time 1E
(g) 4,49,078; Four lakh forty-nine thousand seventy-eight 1. (a) 840 (b) 790 (c) 1000 (d) 3270
(h) 2,57,141; Two lakh fifty-seven thousand one hundred forty-one (e) 7550 (f) 9050 (g) 10,200 (h) 14,560
5. (a) 52,483; Fifty-two thousand four hundred eighty-three 2. (a) 2800 (b) 4600 (c) 5100 (d) 9400
(b) 60,135; Sixty thousand one hundred thirty-five (e) 7500 (f) 14,700 (g) 32,200 (h) 43,600
(c) 5,42,638; Five lakh forty-two thousand six hundred thirty-eight 3. (a) 23000 (b) 44000 (c) 60000 (d) 124000
6. (a) 56,202; 56,203; 56,204; 56,205; 56,206; 56,207; 56,208; 56,209; (e) 346000 (f) 986000 (g) 754000 (h) 833000
56,210; 56,211; 56,212; 56,213; 56,214; 56,215; 56,216; 56,217; Practice Time 1F
56,218 1. (a) VIII (b) XVIII (c) XXV (d) XXIX (e) XCV
(b) 44,445; 44,446; 44,447; 44,448; 44,449; 44,450; 44,451; 44,452; (f) C (g) CXLIX (h) CCLIX (i) CCCLXIV (j) CCCLXIX
44,453; 44,454; 44,455; 44,456; 44,457; 44,458; 44,459 2. (a) 29 (b) 42 (c) 49 (d) 98 (e) 84
(c) 29,057; 29,058; 29,059; 29,060; 29,061; 29,062; 29,063; 29,064 (f) 157 (g) 251 (h) 305 (i) 335 (j) 358
(d) 53,496; 53,497; 53,498; 53,499; 53,500; 53,501; 53,502; 53,503; 3. (a) 19 (b) 3 (c) 19 (d) 36
53,504; 53,505; 53,506; 53,507; 53,508; 53,509 4. (a) XXII (b) XLIX (c) CL (d) CC
Think and Answer Mental Maths
1. 1,00,000 2. 6 1. 700 2. 872500 3. 124
Practice Time 1B Brain Sizzlers
1. (a) 900 (b) 70000 (c) 7000 1. 98760 2. 123450 3. 987065
(d) 0 (e) 400000 (f) 0 Chapter Assessment
2. (a) 47889 = 40000 + 7000 + 800 + 80 + 9
(b) 80791 = 80000 + 700 + 90 + 1 1. (a) (iii) (b) (i) (c) (ii) (d) (iv)
(c) 578914 = 500000 + 70000 + 8000 + 900 + 10 +4 2. (a) 5; 5000 (b) 8 (c) 0 (d) 7 (e) 4
(d) 800450 = 800000 + 400 + 50 3. (a) (iv) (b) (i) (c) (ii) (d) (iii)
3. (a) 308960 (b) 143629 (c) 875402 4. (a) 3 (b) 5 (c) 4
4. (a) 34363, 34365 (b) 73647, 73649 (c) 11142, 11144 5. (a) 56,307; 56,309 (b) 2,10,500; 2,10,300
(d) 840067, 840069 (e) 154835, 154837 (f) 199998, 200000 6. (c) 5,82,354; 7,82,354 (b) 694345, 695345, 696345
(a) 105788, 105888, 105988
7. Three lakhs twenty-five thousand five hundred one
5. (a) 60006 (b) 39996 8. Current year 9. Narayan’s father
Practice Time 1C 10. 90,000 11. 10001, 100001 (Answer may vary)
1. (a) < (b) < (c) > (d) < 12. (a) False (b) False (c) False (d) True
2. (a) Greatest no.: 87,856 Smallest no.: 38,857
(b) Greatest no.: 4,88,332 Smallest no.: 45,657 Chapter 2. Addition and Subtraction
(c) Greatest no.: 6,45,562 Smallest no.: 6,45,172 Let’s Recall
(d) Greatest no.: 5,78,960 Smallest no.: 5,68,960
3. (a) 27,656 < 27,895 < 75,690 < 88,975 1. (a) 5999 (b) 2714 2. 3656
3.
Total population = 994, difference of their Population = 158
(b) 39,850 < 39,856 < 39,876 < 49,560 4. Samina, 34 words more
(c) 26,565 < 2,56,561 < 2,56,563 < 2,56,567
(d) 17,654 < 3,76,946 < 6,76,546 < 8,56,565; Practice Time 2A
4. (a) 42,560 > 42,206 > 42,105> 42,103 1. (a) 94654 (b) 379339 (c) 869689 (d) 934161
(b) 68,987 > 68,978 > 68,968 > 68,960 (e) 942866 (f) 527824
(c) 7,79,568 > 7,79,567 > 7,59,678 > 7,59,576; 2. (a) 455743 (b) 989999 (c) 688994 (d) 789999
(d) 9,99,999 > 9,96,999 > 9,89,999 > 9,83,456 (e) 879384 (f) 929958

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