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Answers

Chapter 1: Numbers Exercise 1D
Warm Up 1. a. 4,320; 2,034 b. 9,763; 3,679
1. a. Two thousand five hundred twenty-five kilometres c. 85,430; 30,458 d. 96,321; 12,369
b. Four thousand one hundred twelve kilometres 2. a. 7,532; 2,357 b. 8,754; 4,578
c. Nine thousand one hundred fifty metres c. 9,830; 3,089 d. 9,610; 1,069
d. Two thousand four hundred forty-four metres 3. a. 88,543; 33,458 b. 77,760; 60,007 c. 88,872; 22,278 vvi
e. One thousand five hundred seven metres d. 99,960; 60,009 e. 55,550; 50,000
f. Eight thousand five hundred eighty-six metres Exercise 1E
2. a. 200 b. 500 c. 9,586 d. 4,112 e. 9, 1, 5, 0 1. a. 50 b. 210 c. 740 d. 560 e. 1,080
3. 2762 f. 2,370 g. 5,750 h. 9,050 i. 10,200 j. 14,560
Exercise 1A 2. a. 300 b. 600 c. 2,800 d. 4,600 e. 5,000
1. a. 56,413 b. 83,092 c. 66,352 d. 90,003 f. 2,500 g. 9,400 h. 7,500 i. 14,700 j. 43,600
2. a. 53,649 → Fifty-three thousand six hundred forty-nine 3. a. 350; 300 b. 570; 600 c. 240; 200 d. 1,360; 1,400
b. 14,683 → Fourteen thousand six hundred eighty-three e. 2,410; 2,400
c. 20,403 → Twenty thousand four hundred three 4. a. 8,850 m; 8,800 m b. 2,530 km; 2,500 km
d. 53,967 → Fifty-three thousand nine hundred sixty-seven c. 12,740 km; 12,700 km d. 430 km; 400 km
3. a. 42,864 b. 90,649 Learning Logs
4. a. 56,202; 56,203; 56,204; 56,205; 56,206; 56,207; 56,208; 56,209; 1. a. Kanchenjunga
56,210; 56,211; 56,212; 56,213; 56,214; 56,215; 56,216; 56,217 and b. 22940 ft., 23760 ft., 24370 ft., 25446 ft., 25643 ft., 28169 ft.
56,218
Rishi
b. 44,445; 44,446; 44,447; 44,448; 44,449; 44,450; 44,451; 44,452; 44,453; d. Pahar Nanda Kangchen- K12 Mukut Kamet
Parbat
junga
Devi
44,454; 44,455; 44,456; 44,457; 44,458 and 44,459 22,900 ft. 25,600 ft. 28,200 ft. 24,400 ft. 23,800 ft. 25,400 ft.
c. 29,057; 29,058; 29,059; 29,060; 29,061; 29,062; 29,063; and
29,064 2. a. 50, 5 b. 6000, 6 c. 50,000, 5 d. 400, 4
d. 53,496; 53,497; 53,498; 53,499; 53,500; 53,501; 53,502; 53,503; 3. a. < b. > c. > d. <
53,504; 53,505; 53,506; 53,507; 53,508 and 53,509 4. a. 14,587; 14,585 b. 32,009; 32,007
5. a. 600, 6 b. 40,000, 4 c. 60, 6 d. 7000, 7 c. 39,010; 39,008 d. 69,898; 69,896
e. 0, 0 5. a. 28,500, 39,542, 52,800, 58,002, 67,019, 82,500
6. a. 20,000 + 4000 + 600 + 30 + 9 b. 70,000 + 40 + 5 b. 98,677, 87,696, 78,765, 37,852, 9,998, 3,705
c. 80,000 + 2000 + 900 + 60 + 3 d. 90,000 + 900 + 90 + 9 6. a. 843 b. 870 c. 931 7. 88,743
7. a. 60,060; 59,940 b. 60,060; 59,940 8. a. 1123, 3321 b. 2259, 9952 c. 1,003, 3,310
c. 6,060; 5,940 d. 60,006; 59,994 Mental Maths
8. a. Hundreds b. Three places 1. c 2. b 3. a 4. d 5. a 6. b
c. 45 d. 3,643 HOTS
Exercise 1B
1. 20,555; 20,529
3. a. ii. 36,506; 36,516; 36,526; 36,536; 36,546
iii. 73,650; 73,660; 73,670; 73,680; 73,690
b. ii. 54,461; 54,561; 54,661; 54,761; 54,861
iii. 73,278; 73,378; 73,478; 73,578; 73,678
c. ii. 8,248; 9,248; 10,248; 11,248; 12,248 Chapter 2: Addition and Subtraction
iii. 61,436; 62,436; 63,436; 64,436; 65,436 Warm Up
4. a. 34365 b. 73649 c. 11144 d. 40069 e. 54837 f. 20000 1. a. 1548 visitors b. 2085 visitors c. 2250 visitors
5. a. 12729 b. 5429 c. 91347 d. 43648 e. 73644 f. 56303 d. 1696 visitors e. 2053 visitors
Exercise 1C 2. a. 492 visitors b. 405 visitors c. 830 visitors
1. a. < b. > c. < d. > e. < f. < d. 272 visitors e. 1203 visitors
2. a. 8,957; 7,856 b. 88,332; 5,657 Exercise 2A
c. 45,562; 45,172 d. 78,960; 68,960 1. a. 1 b. 1 c. 2436 d. 0 e. 0 f. 9999
3. a. 6,560; 8,850; 8,856; 8,876 b. 65,690; 67,656; 67,895; 98,975 g. 246 h. 4021
c. 56,561; 56,563; 56,565; 56,567 2. a. 8465 b. 56884 c. 66897
d. 56,565; 67,654; 76,546; 76,946 3. a. 6355 b. 42146 c. 79686
4. a. 8,987; 8,978; 8,968; 8,960 b. 3,560; 3,206; 3,105; 3,103 4. a. 4370 b. 8475 c. 10582 d. 14568 e. 52430 f. 67523
c. 79,568; 79,567; 59,678; 59,576 d. 99,999; 96,999; 89,999; 83,456 g. 16149 h. 87373 i. 90757
5. Mercury, Earth, Uranus, Saturn, Jupiter 5. a. 10812 b. 13821 c. 62034 d. 98887

220 Mathematics 4