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Answers

Chapter 1: Large Numbers 4. smallest-305678, greatest-876530
5. Smallest-10456789, greatest-98765410
Let’s Recall 6. (a) 7775420, 2000457 (b) 9999765, 5555679
1. Three lakh eighty-four thousand four hundred. (c) 7777320, 2000037 (d) 9999953, 3333359
2. Largest 6-digit number = 999999 and Smallest 6-digit number = 100000.
3. (a) Seven lakh fifty-four thousand eight hundred ninety-four. Practice Time 1D
(b) Five lakh four hundred eighty-nine. 1. (a) 65,028,107 (b) 82,245,000 (c) 59,106,307 (d) 40,093,406
4. (a) 8,47,001 (b) 9,99,999. (e) 72,007,700 (f) 98,999,099
5. (a) Face value = 2, Place value = 20000. 2. (a) Twenty-five million eight hundred ninety thousand four hundred
(b) Face value = 0, Place value = 0. sixty-seven
6. 540789 > 507489. (b) Forty-three million eight hundred sixty-five thousand eight hundred
Practice Time 1A ninety
1. (a) Forty-six lakh thirty-four thousand five hundred sixty-one. (c) Five million seventy thousand six
(b) Forty lakh fifty-six thousand two hundred forty-nine. (d) Fifty-two million eight hundred thousand five hundred thirty-one
(c) Seven crore seventy-three lakh twenty-six thousand four hundred (e) Six million one hundred thousand seven hundred eighty-two
thirty-four. (f) Twenty million two hundred thousand two hundred
(d) Eight crore seventy-nine lakh twenty-eight thousand forty-three 3. (a) 78,987,656 (b) 89,007,650 (c) 80,004,905 (d) 7,540,565
(e) Seven crore thirty lakh thirty-eight thousand nine hundred sixty-three. (e) 95,493,207 (f) 34,896,705
(f) Five lakh forty-five thousand eight hundred sixty-four. 4. (a) 1000 (b) 100 (c) 10 (d) 100
2. (a) 5,34,948 (b) 50,70,694 (c) 6,66,24,412 (d) 7,00,73,016 Practice Time 1E
3. (a) 78,54,475 — Seventy-eight lakh fifty-four thousand four hundred
seventy-five. 1. (a) 80 (b) 250 (c) 870 (d) 4240
(b) 7,98,76,560 — Seven crore ninety-eight lakh seventy-six thousand (e) 6050 (f) 8870 (g) 68740 (h) 508380
five hundred sixty. 2. (a) 400 (b) 600 (c) 7700 (d) 8900
(c) 8,00,78,004 — Eight crore seventy-eight thousand four. (e) 17200 (f) 28800 (g) 120100 (h) 318600
(d) 5,76,54,323 — Five crore seventy-six lakh fifty-four thousand three 3. (a) 9000 (b) 9000 (c) 108000 (d) 37000
hundred twenty-three. (e) 219000 (f) 59000 (g) 1036000 (h) 2867000
(e) 6,00,52,902 — Six crore fifty-two thousand nine hundred two. 4. (a) (i) 52670 (ii) 52700 (iii) 53000
(f) 5,99,34,230 — Five crore ninety-nine lakh thirty-four thousand two (b) (i) 37650 (ii) 37600 (iii) 38000
hundred thirty. (c) (i) 25890 (ii) 25900 (iii) 26000
4. 1 one = 1, 4 ten = 40, 9 hundred = 900, 7 thousand = 7000, 8 ten thousand (d) (i) 41980 (ii) 42000 (iii) 42000
= 80000, 7 lakh = 700000, 6 ten lakh = 6000000, 1 crore = 10000000. (e) (i) 547130 (ii) 547100 (iii) 547000
Practice Time 1B (f) (i) 258360 (ii) 258400 (iii) 258000
1. (a) 70 (b) 6000 (c) 400000 (d) 0 (e) 70000000 (g) (i) 362780 (ii) 362800 (iii) 363000
(f) 800000 (g) 0 (h) 5000000 (i) 70000 (h) (i) 1670250 (ii) 1670200 (iii) 1670000
2. 8000000 – 800 = 7999200 Practice Time 1F
3. 6000 + 600000 = 606000 1. (a) CCCXXVIII (b) DXVIII (c) DCCCXCII (d) MMXC
4. (a) Predecessor — 2684502, Successor — 2684504 (e) DCCLXXXV (f) MDC
(b) Predecessor — 7095204, Successor — 7095206 2. (a) 35 (b) 73 (c) 7 (d) 1009 (e) 165 (f) 1034
(c) Predecessor — 5598004, Successor — 5598006 3. (a) < (b) > (c) = (d) > (e) = (f) <
(d) Predecessor — 4030199, Successor — 4030201 4. (b), (c), (d), (e) and (f)
(e) Predecessor — 67600541, Successor — 67600543 5. (a) MDCCCLXIX (b) MDCCCLXXXIII (c) MCMXX
(f) Predecessor — 90908031, Successor — 90908033
(g) Predecessor — 30540319, Successor — 30540321 (d) MCMXXX (e) MCMXLII (f) MCMXLIV
(h) Predecessor — 88732100, Successor — 88732102 (g) MCMXLVIII
5. (a) 70000000 + 7000000 + 800000 + 50000 + 6000 + 400 + 30 + 2 Mental Maths
(b) 90000000 + 5000000 + 600000 + 70000 + 8000 + 900 + 80 + 1 1. (d) 2. (b) 3. (c) 4. (d) 5. (b) 6. (a)
(c) 7000000 + 300000 + 40000 + 0000 + 700 + 10 + 8 Maths Connect
(d) 80000000 + 6000000 + 900000 + 80000 + 7000 + 600 + 50 + 5
(e) 30000000 + 7000000 + 800000 + 90000 + 8000 + 700 + 60 + 2 Ascending order: Andhra Pradesh < Bihar < Maharashtra < Uttar Pradesh
(f) 8000000 + 400000 + 90000 + 9000 + 300 + 80 + 5 Descending order: Uttar Pradesh > Maharashtra > Bihar > Andhra
(g) 70000000 + 6000000 + 200000 + 50000 + 9000 + 000 + 00 + 5 Pradesh
(h) 40000000 + 5000000 + 600000 + 00000 + 0000 + 200 + 80 + 2 Maths Fun
(i) 9000000 + 900000 + 80000 + 3000 + 400 + 50 + 1
6. (a) 80046053 (b) 70074502 (c) 9059304 (d) 5908073 1. 2.
(e) 40405002
Practice Time 1C 3. 4.
1. (a) > (b) > (c) < (d) > (e) = (f) <
2. (a) 863532, 7324545, 7825216, 8654627 Chapter Assessment
(b) 2000413, 2050009, 2500496, 5231761
(c) 6954521, 6954524, 6954530, 6954544 1. (a) (ii) (b) (iii) (c) (iv) (d) (iii)
(d) 7546321, 7546325, 7546452, 7546542 2. 9854317 3. 0 4. 100 thousands
3. (a) 97479, 87976, 76049, 75959 5. 10000 thousands 6. Nearest 1000 7. IM and VX
(b) 654675, 528781, 453170, 452678 8. Earth by 3010000 m 9. DXCV
(c) 9400045, 7983678, 7893569, 798667 10. 3,782; Three thousand seven hundred eighty-two; three thousand seven
(d) 98645321, 9865021, 9864542, 9864521 hundred eighty-two.

264 Mathematics-5