984671

Here, descending order of the given digits is 5,4, 3, 0.
∴ Greatest number = 5430
and ascending order of the given digits is 0,3,4, 5.
But 0345 is a three-digit number. So, we have to interchange the place of 3 and 0 i.e 3045.
∴ Smallest number = 3045.

Here, descending order of the given digits is 7, 6, 2, 1
∴ Greatest number = 7621
and ascending order of the given digits is 1,2,6, 7.
∴ Smallest number = 1267.

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.

Given, numbers are 847, 9754, 8320 and 571.
To convert numbers into ascending numbers, we arrange numbers smallest to the greatest.
Now, ascending order is 571 < 847 < 8320 < 9754.

Given digits are 3, 0 and 4.
We can make many numbers by using these digits, five of them are as follows:
(i) 330443 (ii) 343404 (iii) 344430 (iv) 434043 (v) 344034
Using commas, these numbers can be rewritten as :
(i) 3,30,443 (ii) 3,43,404 (iii) 3,44,430 (iv) 4,34,043 (v) 3,44,034

(a) We have, 847, 9754, 8320, 571
Ascending order of given numbers is as follows:
571 < 847 < 8320 < 9754
(b) We have, 9801, 25751, 36501, 38802
Ascending order of given numbers is as follows:
9801 < 25751 < 36501 < 38802

Five more situations may be
(i) Prices of 4 different kinds of branded shoes are Rs.4225, Rs.3835, Rs. 2620 and Rs. 2230, respectively.
(ii) The weight of 4 students of Class VI are 33 kg, 38 kg, 35 kg and 37 kg, respectively.
(iii) Marks obtained by 4 students in Mathematics out of 100 are 87, 88, 90 and 78, respectively.
(iv) The tution fee paid by 4 students of different classes are Rs. 170, Rs. 190, Rs. 150 and Rs. 200, respectively.
(v) The runs scored by 4 players A, B, C and D in an innings are 75, 60, 25 and 82, respectively.

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 7 at ones place, we can fill other places tens, hundreds and thousands by remaining numbers.
Greatest number 

-[Keeping the greatest digits i.e. 9, 8 and 6 at thousands, hundreds and tens place]
Smallest number

[Keeping the smallest digits i.e. 0, 1, 2 at hundreds, thousands and tens place. If keep 0 at thousands place, then number will be equal to 3-digit number]

Given digits are 8, 5 and 1.
Here, descending order of the given digits is 8, 8, 5, 1. [∴ greatest digit 8 is taken twice]
∴ Greatest 4-digit number = 8851
and ascending order of the given digits is 1, 1, 5, 8. [∴ smallest digit 1 is taken twice]
∴ Smallest 4-digit number = 1158.

The names of five large cities in India are Delhi, Bengaluru, Kolkata, Hyderabad and Chennai.
Process of making the pair of cities are given below:
We have, Delhi, Bengaluru, Kolkata, Hyderabad and Chennai
First, we take Delhi as base city
So,

Now, we take Bengaluru as base city.

Now, we take Kolkata as base city.
So,

Now, we take Hyderabad as base city.
So,

Their respective population can be taken from a book of general awareness. However, the distance (in kilometres) between each pair of these cities is given below:

These are the national distances between the cities.

Given digits are 4, 5, 6, 0, 7 and 8.
We can make many numbers by using these digits, five of them are as follows:
876540, 867540, 876450, 876045 and 867405
(a) After putting commas, numbers are as follows:
(i) 8,76,540 (ii) 8,67,540
(iii) 8,76,450 (iv) 8,76,045
(v) 8,67,405
(b) Ascending order of numbers is as follows:
867405 < 867540 < 876045 < 876450 < 876540
Descending order of numbers is as follows:
876540 > 876450 > 876045 > 867540 >  867405.

The remaining blanks are shown as below with appropriate number, name and expansion: