Page 282 - ICSE Math 6

ANSWERS

Chapter 1 9. (a) 15,000 (b) 15,00,000 (c) 10,00,000
(d) 3,00,000
Exercise 1.1
1. (a) 1,000 (b) 1 (c) 0 (d) 5 (e) 70 (f) 50,000 10. (a) 30 (b) 30 (c) 30 (d) 35
2. 3,000 and 30; 2,970 3. 8 4. 22 Mental Maths
5. (a) 85,055; Eighty-five thousand fifty-four 1. (a) 10 (b) 100 (c) 100 (d) 10 (e) 10
(b) 3,97,54,081; Three crore ninety-seven lakh fifty-four (f) 100 (g) 6 (h) 9; 9,000
thousand eighty-one 2. (a) > (b) < (c) > (d) <
(c) 4,74,81,405; Four crore seventy-four lakh eighty-one Practice Time
thousand four handred five 1. (a) 78,28,790; Seventy-eight lakh twenty-eight thousand
6. (a) 7,835,410; Seven million eight hundred thirty five seven hundred ninety
thousand four hundred ten (b) 81,23,456; Eighty-one lakh twenty-three thousand
(b) 67,234,189; Sixty-seven million two hundred thirty- four hundred fifty-six
four thousand one hundred eighty-nine (c) 1,24,56,789; One crore twenty-four lakh fifty-six
(c) 24,892,348; Twenty-four million eight hundred ninety- thousand seven hundred eighty-nine
two thousand three hundred eighty-four (d) 3,46,85,811; Three crore forty-six lakh eighty-five
7. (a) 12,567 (b) 4,50,98,145 (c) 4,98,71,002 thousand eight hundred eleven
(d) 3,49,88,067 2. (a) 1,427,323; One million four hundred twenty-seven
8. 2,95,10,200 > 2,95,00,141 > 1,95,45,678 > 1,48,05,654 > thousand three hundred twenty-three
78,13,018 > 70,99,954 (b) 44,556,710; Forty-four million five hundred fifty-six
thousand seven hundred ten
Exercise 1.2 (c) 29,175,434,370; Twenty-nine billion one hundred
1. (a) 249 (b) 309 (c) 102 (d) 189 seventy-five million four hundred thirty-four thousand
2. 96,210 three hundred seventy
3. Greatest: 9,650; Smallest: 5,069 (d) 2,170,034,001; Two billion one hundred seventy
4. Greatest: 9,999; Smallest: 1,000 million thirty-four thousand one
5. 1,00,040 3. (a) 75,55,804 (b) 9,49,00,600 (c) 5,84,02,509

6. (a) 10,000 (b) 19,999 (c) 9 (d) 0 4. 80,000 and 80 7. 9,99,989 5. 0
6. 1,02,459
8. 10,900
7. 900
9. ` 25,34,698 10. 1,30,248 11. 110
Exercise 1.3 12. (a) Actual: 1,443 Estimated: 1,500
1. ` 7,74,588 2. 13,42,691 (b) Actual: 12,213 Estimated: 12,000
3. 91,05,345 sacks 4. 15,01,882 13. 2,00,000 14. 25 15. 2,49,536 16. ` 50,000
5. ` 40,592 6. ` 14,29,53,720 Think Smart
7. 75,195 8. 12.5 m 1. No, as 99,998 > 54,299. 2. 2 and 6
9. 11 trousers; 70 cm 10. 22 km 500 m 3. Largest: 9,99,973; Smallest: 3,379;
11. 21 12. ` 5,81,20,380
Expanded form of difference: 9 × 1,00,000 + 9 × 10,000
Exercise 1.4 + 6 × 1,000 + 5 × 100 + 9 × 10 + 4 × 1
1. (a) 110 (b) 120 (c) 1,610 (d) 1,000 Chapter 2
2. (a) 1,000 (b) 1,500 (c) 1,700 (d) 12,800 Exercise 2.1
3. (a) 1,34,000 (b) 79,000 (c) 79,000 (d) 66,000 1. (a) 2,35,680 (b) 7,86,421 (c) 9,80,100
4. (a) 30 (b) 260 (c) 240 (d) 190 2. (a) 5,66,999 (b) 34,59,079 (c) 89,00,119
5. (a) 300 (b) 200 (c) 500 (d) 400 3. Largest whole number does not exist. 4. 30
6. (a) 5,000 (b) 1,000 (c) 2,000 (d) 1,000
7. (a) 3,000 (b) 2,100 (c) 2,400 (d) 2,000 5. (a)
0 1 2 3 4 5 6 7 8 9 10 11 12
8. (a) 3,00,000 (b) 40,000 (c) 50,000 (d) 40,000 Thus, 5 + 6 = 11

266