RS Aggarwal Class 6 Math First Chapter Number System Exercise 1A Solution
EXERCISE 1A
1. Write the numeral for each of the following numbers:
a. Nine thousand eighteen
b. Fifty-four thousand seventy-three
c. Three lakh two thousand five hundred six
d. Twenty lakh ten thousand eight
e. Six crore five lakh fifty-seven
f. Two crore two lakh two thousand two hundred two
g. Twelve crore twelve lakh twelve thousand twelve
h. Fifteen crore fifty lakh twenty thousand sixty-eight
ANS: a. 9018 b. 54073 c. 302506 d. 2010008
e. 60500057 f. 20202202 g. 121212012 h. 155020068
2. Write each of the following numbers in words:
a. 63,005 b. 7,07,075 c. 34,20,019
d. 3,05,09,012 e. 5,10,03,604 f. 6,18,05,008
g. 19,09,09,900 h. 6,15,30,807 i. 6,60,60060
ANS: a. Sixty three thousand five
b.Seven lakh seven thousand seventy-five
c. Thirty-four lakh twenty thousand
d. Three crore five lakh nine thousand twelve
e. Five crore ten lakh three three thousand six hundred four
f. Six crore eighteen lakh five thousand eight
g. Nineteen crore nine lakh nine thousand nine hundred
h. Six crore fifteen lakh thirty thousand eight hundred eight hundred seven
i. Six crore sixty lakh sixty thousand sixty
3. Write each of the following numbers in expanded form:
a. 15,768 b. 3,08,927 c. 24,05,609
d. 5,36,18,493 e. 6,06,06,006 f. 9,10,10,510
ANS: a. 15768= (1 x 10000) + (5 x 1000) + (7 x 100)+ (6 x 10)+(8 x 1)
b. 308927= (3 x 100000)+(8 x 1000)+(9 x 100)+(2 x 10)+(7 x 1)
c. 2405609= (2 x 1000000)+(4 x 100000)+(5 x 1000)+(6 x 100)+(9 x 1)
d. 53618493= (5 x 10000000)+(3 x 1000000)+(6 x 100000)+(1 x 10000)
+(8 x 1000)+(4 x 100)+(9 x 10)+(3 x 1)
e. 60606006= (6 x 10000000)+(6 x 100000)+(6 x 1000)+(6 x 1)
f. 91010510= (9 x 10000000)+ (1 x 1000000)+(1 x 10000)+(5 x 100)+(1 x 10)
4. Write the corresponding numeral for each of the following:
a. 6 x 10000 + 2 x 1000 + 5 x 100 + 8 x 10 + 4 x 1
b. 5 x 100000 + 8 x 10000 + 1 x 1000 + 6 x 100 + 2 x 10 + 3 x 1
c. 2 x 10000000 + 5 x 100000 + 7 x 1000 + 9 x 100 + 5 x 1
d. 3 x 1000000 + 4 x 100000 + 6 x 1000 + 5 x 100 + 7 x 1
ANS: a. 62584 b. 581623 c. 20507905 d. 3406507
5. Find the difference between the place values of the two nines in 79520986.
ANS: 8999100
6. Find the difference between the place values of the face value and the face value of 7 in 27650934.
ANS: 6999993
7. How many 6-digit numbers are there in all?
ANS: 900000
8. How many 7-digit numbers are there in all?
ANS: 9000000
9. How many thousands make a lakh?
ANS: 100 thousands
10. How many thousands make a crore?
ANS: 10000 thousands
11. Find the difference between the number 738 and that obtained on reversing its digits.
ANS: 99
12. What comes just after 9547999?
ANS: 9548000
13. What comes just before 9900000?
ANS: 9899999
14. What comes just before 10000000?
ANS: 9999999
15. Write all 3-digits numbers using 2, 3, 4, taking each digit only once.
ANS: 234, 324, 243, 342, 423, 432
16. Write the smallest number of different digits formed by using the digits 3, 1, 0, 5 and 7.
ANS: 10357
17. Write the largest number of different digits formed by using the digits 2, 4, 0, 3, 6 and 9.
ANS: 964320
18. Rewrite each of the following numerals with proper commas, using the international place-value chart. Also, write the number name of each in the international system.
a. 735821 b. 6057894 c. 56943821
d. 37502093 e. 89350064 f. 90703006
ANS:
| HM | TM | M | H Th | T Th | Th | H | T | O | |
| a. | 7 | 3 | 5 | 8 | 2 | 1 | |||
| b. | 6 | 0 | 5 | 7 | 8 | 9 | 4 | ||
| c. | 5 | 6 | 9 | 4 | 3 | 8 | 2 | 1 | |
| d. | 3 | 7 | 5 | 0 | 2 | 0 | 9 | 3 | |
| e. | 8 | 9 | 3 | 5 | 0 | 0 | 6 | 4 | |
| f. | 9 | 0 | 7 | 0 | 3 | 0 | 0 | 6 | |
| C | TL | L | T Th | Th | H | T | O |
In words, these numbers are:
a. Seven hundred thirty-five thousand eight hundred twenty-one
b. Six million fifty-seven thousand eight hundred ninety-four
c. Fifty-six million nine hundred forty-three thousand eight hundred twenty-one
d. Thirty-seven million five hundred two thousand ninety-three
e. Eighty-nine million three hundred fifty thousand sixty-four
f. Ninety million seven hundred three thousand and six
19. Write each of the following in figures in the international place-value chart:
a. Thirty million one hundred five thousand sixty-three
b. Fifty-two million two hundred five thousand six
c. Five million five thousand five
| HM | TM | M | H Th | T Th | Th | H | T | O | |
| a. | 3 | 0 | 1 | 0 | 5 | 0 | 6 | 3 | |
| b. | 5 | 2 | 2 | 0 | 5 | 0 | 0 | 6 | |
| c. | 5 | 0 | 0 | 5 | 0 | 0 | 5 |
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