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Published on: 30/08/2019
Knowing our Numbers
Download CBSE Class 6th Standard CBSE Mathematics question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 6th Standard CBSE Mathematics
Questions + Answers key
Take MCQ Mathematics Test
1.
Use the given digits without repetition and make the greatest and smallest 4-digit numbers. 4, 7, 5, 0.
2.
Use the given digits without repetition and make the greatest and smallest 4-digit numbers. 2, 8, 7, 4.
3.
Can you instantly find the greatest and the smallest numbers in the row? 1834, 75284, 111, 2333, 450.
4.
Arrange the numbers 819, 5240, 890, 6249 in descending order.
5.
Make the greatest and the smallest 4-digit numbers using any four different digits with conditions given below.
Digit 9 is always at hundreds place
6.
Make the greatest and the smallest 4-digit numbers using any four different digits with conditions given below:
Digit 4 is always at tens place
7.
Make the greatest and the smallest 4-digit numbers by using anyone digit twice. 0, 4, 9.
8.
Read and expand the numbers wherever there are blanks.
| Number | Number name | Expansion |
| 20000 | Twenty thousands | 2 \(\times\)10,000 |
| 26000 | Twenty six thousands | 2 \(\times\)10,000+6 \(\times\)1,000 |
| 38400 | Thirty eight thousands four hundreds | 3\(\times\)10,000+8 \(\times\)1,000+4\(\times\)100 |
| 65740 |
Sixty five thousands seven hundreds forty |
6\(\times\)10,000+5\(\times\)1,000+7\(\times\) 100+4\(\times\) 10 |
| 89324 | Eighty nine thousands three hundreds twenty four | 8\(\times\)10,000+9\(\times\)1,000+3\(\times\) 100+2\(\times\) 10+4\(\times\)1 |
| 50000 | ||
| 41000 | ||
| 47300 | ||
| 57630 | ||
| 29485 | ||
| 29085 | ||
| 20085 | ||
| 20005 |
9.
(a) 1m =--- mm (b) 1 cm =----- mm
10.
The smallest 4-digit number with different digits is ------
11.
1 million = ____ lakhs
12.
1 crore = _____ ten lakhs
13.
The number formed by interchanging the digits 6 and 2 in 465271 is
467521
425671
165274
None of these
14.
Which of the following roman symbol is never repeated?
I
V
X
C
15.
The numbers 4578,4587,5478,5487 are in ascending order.
16.
LXXV is greater than LXXIV.
17.
The number 58663 rounded off to nearest hundred is 58600.
18.
531 = DXXXI
19.
What would be the number of grains in a sackfull of wheat? A 5-digit number, a 6-digit number or more?
20.
Do you know the number of people in your state? How many digits would that number have?
21.
The number of people in the nearby town would be much larger. Is ita5 or6 or 7-digit number?
1.
Here, descending order of the given digits is 7, 5,4, 0.
∴ Greatest number = 7540
and ascending order of the given digits is 0, 4, 5, 7.
But, 0457 is a three-digit number, so we have to interchange the place of 4 and 0 i.e. 4057.
∴ Smallest number = 4057.
2.
Here, descending order of the given digits is 8, 7, 4, 2.
∴ Greatest number = 8742
and ascending order of the given digits is 2, 4, 7, 8.
∴ Smallest number = 2478.
3.
75284 is the greatest number, because it has highest number of digits i.e. 5 and III is the smallest number, because it has least number of digits i.e. 3.
4.
Given, numbers are 819, 5240, 890 and 6249.
To convert numbers into descending order, we arrange numbers greatest to the smallest.
Now, descending order is 6249 > 5240> 890> 819.
5.
Digits in ascending order are 0,1,2,3,4,5,6,7,8,9 and digits in descending order are 9,8,7,6,5,4,3,2,1, 0. Also, we know that 0 can never be taken at the leftmost place.
Keeping the digit 9 at hundreds place, we can fill thousands, tens and ones place by remaining digits.
Greatest number
| 8 | 9 | 7 | 6 |
[Keeping the greatest digit i.e. 8, 7 and 6 at thousands, tens and ones place]
Smallest number
| 1 | 9 | 0 | 2 |
[Keeping the smallest digit l.e. 1, 0 and 2 at thousands, tens and ones place]
6.
Digits in ascending order are 0,1,2,3,4,5,6,7,8,9 and digits in descending order are 9,8,7,6,5,4,3,2,1, 0. Also, we know that 0 can never be taken at the leftmost place.
Keeping the digit 4 at tens place, we can fill other places thousands, hundreds and ones place by remaining number.
Greatest number
| 9 | 8 | 4 | 7 |
[Keeping the greatest digits i.e. 9, 8 and 7 at thousands, hundreds and tens place]
Smallest number
| 1 | 0 | 4 | 2 |
[Keeping the smallest digits i.e. 9, 8 and 7 at thousands, hundreds and tens place].
7.
Given digits are 0, 4 and 9.
Here, descending order of the given digits is 9, 9, 4, 0. [∵ greatest digit 9 is taken twice]
∴ Greatest 4-digit number = 9940
and ascending order of the given digit is 0, 0, 4, 9. [∵ smallest digit 0 is taken twice]
But 0049 is a 2-digit number, because 0 at first two leftmost places is meaningless. So, keeping 4 (instead of 0) at the leftmost place and taking the smallest digit o twice, we get 4009.
∴ Smallest 4-digit number = 4009.
8.
The remaining blanks are shown as below with appropriate number, name and expansion:
| Number | Number name | Expansion |
| 50000 | Fifty thousands | 5 \(\times\) 10,000 |
| 41000 | Forty one thousands | 4 \(\times\) 10,000 + 1 \(\times\) 1,000 |
| 47300 | Forty seven thousands three hundreds | 4\(\times\)10,000 + 7 \(\times\) 1,000 + 3 \(\times\) 100 |
| 57630 | Fifty seven thousands six hundreds thirty | 5 \(\times\) 10,000 + 7 \(\times\) 1,000 + 6 \(\times\) 100 + 3\(\times\)10 |
| 29485 | Twenty nine thousands four hundreds eighty five | 2 \(\times\)10,000 + 9\(\times\) 1,000 + 4 \(\times\) 100 + 8 \(\times\) 10 + 5 \(\times\) 1 |
| 29085 | Twenty nine thousands eighty five | 2 \(\times\) 10,000 + 9 \(\times\) 1,000 +8 \(\times\)10+ 5 \(\times\) 1 |
| 20085 | Twenty thousands eighty five | 2\(\times\)10,000 + 8 \(\times\) 10 + 5 \(\times\) 1 |
| 20005 | Twenty thousands five | 2 \(\times\) 10,000 + 5 \(\times\) 1 |
9.
( )
(a) 1 m =1000 mm (b) 1 cm =10 mm
10.
1023 is required smallest four-digit number.
11.
We know that,
1 million = 1000000 (in digits)
= 10 \(\times\)100000 = ten \(\times\) one lakhs (in number name)
∴1 million = ten lakhs
12.
We know that,
1 crore = 10000000 (in digits) = 10 \(\times\)1000000
= ten \(\times\)ten lakhs (in number name)
∴1 crore = ten ten lakhs
13.
(b)
425671
14.
(b)
V
15.
(a)
16.
(a)
17.
(b)
18.
(a)
19.
( )
The number of grains in a sack full of wheat will be a still more digit number.
20.
( )
Yes! my state is U.P. The number of people in my state is 20,00,00,000 approximately. This number has 9-digits.
21.
( )
Yes! the number of people in the nearby town would be much larger. It is a 5-digit number.
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