Selina Textbook Solutions: Number System | Mathematics Class 6 ICSE PDF Download

 Page 1


IMPORTANT POINTS 
1. Place-Value (Local Value) : The place value (Local-value) of a digit depends 
upon the position, it occupies in the number: 
For example : 
In the number 6453 
the place value of 6 is 6 thousand = 6 x 1000 = 6000 
the place value of 4 is 4 hundred = 4 x 100 = 400 
the place value of 5 is 5 ten = 5 x 10 = 50 
the place value of 3 is 3 one = 3 x 1 = 3 
2. Face-Value (True-Value) : Each digit in a number has a fixed value, regardless to 
its position in the number 
For Example : 
In the above number 6453 
Face value of 6 is 6, 4 is 4, 5 is 5 and 3 is 3 
3. An Abstract Number : Which does not refer to any particular unit e.g., 3, 5, 9. 
4. A Concrete Number : Which refers to particular unit e.g., 3 boys, 5 girls, 9 rooms 
etc. 
The smallest (least) one digit Number is 1. 
The largest (greatest) one digit number is 9. 
EXERCISE 1(A) 
Question 1. 
Which is greater ? 
(i) 537 or 98 
(ii) 2428 or 529 
(iii) 2, 59, 467 or 10, 35, 729 
Solution: 
(i) 537 or 98 
Since 537 is three digit number and 98 is two digit number. 
Hence 537 > 98 and 537 is greater 
(ii) 2428 or 529 
Since 2498 is four digit number and 529 is three digit number. 
2498 > 529 ; 2498 is greater 
(iii) 2, 59, 467 or 10, 35, 729 
Since 10, 35, 729 is seven digit number and 2, 59, 467 is six digit number 
10, 35, 729 > 2, 59, 467 ; 10, 35, 729 is greater 
Question 2. 
Which is smaller ? 
(i) 428 or 437 
(ii) 2497 or 2597 
(iii) 3297 or 3596 
Solution: 
Page 2


IMPORTANT POINTS 
1. Place-Value (Local Value) : The place value (Local-value) of a digit depends 
upon the position, it occupies in the number: 
For example : 
In the number 6453 
the place value of 6 is 6 thousand = 6 x 1000 = 6000 
the place value of 4 is 4 hundred = 4 x 100 = 400 
the place value of 5 is 5 ten = 5 x 10 = 50 
the place value of 3 is 3 one = 3 x 1 = 3 
2. Face-Value (True-Value) : Each digit in a number has a fixed value, regardless to 
its position in the number 
For Example : 
In the above number 6453 
Face value of 6 is 6, 4 is 4, 5 is 5 and 3 is 3 
3. An Abstract Number : Which does not refer to any particular unit e.g., 3, 5, 9. 
4. A Concrete Number : Which refers to particular unit e.g., 3 boys, 5 girls, 9 rooms 
etc. 
The smallest (least) one digit Number is 1. 
The largest (greatest) one digit number is 9. 
EXERCISE 1(A) 
Question 1. 
Which is greater ? 
(i) 537 or 98 
(ii) 2428 or 529 
(iii) 2, 59, 467 or 10, 35, 729 
Solution: 
(i) 537 or 98 
Since 537 is three digit number and 98 is two digit number. 
Hence 537 > 98 and 537 is greater 
(ii) 2428 or 529 
Since 2498 is four digit number and 529 is three digit number. 
2498 > 529 ; 2498 is greater 
(iii) 2, 59, 467 or 10, 35, 729 
Since 10, 35, 729 is seven digit number and 2, 59, 467 is six digit number 
10, 35, 729 > 2, 59, 467 ; 10, 35, 729 is greater 
Question 2. 
Which is smaller ? 
(i) 428 or 437 
(ii) 2497 or 2597 
(iii) 3297 or 3596 
Solution: 
(i) 428 or 437 
We observe that both the numbers are of three-digits. 
And at the leftmost, both the number have same digit i.e. 4. But at the second place 
from the left, the first, number has 2 and the second number has 3. 
Since 2 < 3 
437 is greater 
(ii) 2497 or 2597 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
2597 is greater 
(iii) 3297 or 3596 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
3596 is greater 
Question 3. 
Which is greater ? 
(i) 45293 or 45427 
(ii) 380362 or 381007 
(iii) 63520 or 63250 
Solution: 
(i) 45293 or 45427 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 2 and the second 
number has 4. 
Since 2 < 4 
45427 is greater 
(ii) 380362 or 381007 
We observe that both the numbers are of 6-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 0 and the second 
number has 1. 
Since 0 < 1 
381007 is greater 
(iii) 63520 or 63250 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 5 and the second 
number has 2. 
Page 3


IMPORTANT POINTS 
1. Place-Value (Local Value) : The place value (Local-value) of a digit depends 
upon the position, it occupies in the number: 
For example : 
In the number 6453 
the place value of 6 is 6 thousand = 6 x 1000 = 6000 
the place value of 4 is 4 hundred = 4 x 100 = 400 
the place value of 5 is 5 ten = 5 x 10 = 50 
the place value of 3 is 3 one = 3 x 1 = 3 
2. Face-Value (True-Value) : Each digit in a number has a fixed value, regardless to 
its position in the number 
For Example : 
In the above number 6453 
Face value of 6 is 6, 4 is 4, 5 is 5 and 3 is 3 
3. An Abstract Number : Which does not refer to any particular unit e.g., 3, 5, 9. 
4. A Concrete Number : Which refers to particular unit e.g., 3 boys, 5 girls, 9 rooms 
etc. 
The smallest (least) one digit Number is 1. 
The largest (greatest) one digit number is 9. 
EXERCISE 1(A) 
Question 1. 
Which is greater ? 
(i) 537 or 98 
(ii) 2428 or 529 
(iii) 2, 59, 467 or 10, 35, 729 
Solution: 
(i) 537 or 98 
Since 537 is three digit number and 98 is two digit number. 
Hence 537 > 98 and 537 is greater 
(ii) 2428 or 529 
Since 2498 is four digit number and 529 is three digit number. 
2498 > 529 ; 2498 is greater 
(iii) 2, 59, 467 or 10, 35, 729 
Since 10, 35, 729 is seven digit number and 2, 59, 467 is six digit number 
10, 35, 729 > 2, 59, 467 ; 10, 35, 729 is greater 
Question 2. 
Which is smaller ? 
(i) 428 or 437 
(ii) 2497 or 2597 
(iii) 3297 or 3596 
Solution: 
(i) 428 or 437 
We observe that both the numbers are of three-digits. 
And at the leftmost, both the number have same digit i.e. 4. But at the second place 
from the left, the first, number has 2 and the second number has 3. 
Since 2 < 3 
437 is greater 
(ii) 2497 or 2597 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
2597 is greater 
(iii) 3297 or 3596 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
3596 is greater 
Question 3. 
Which is greater ? 
(i) 45293 or 45427 
(ii) 380362 or 381007 
(iii) 63520 or 63250 
Solution: 
(i) 45293 or 45427 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 2 and the second 
number has 4. 
Since 2 < 4 
45427 is greater 
(ii) 380362 or 381007 
We observe that both the numbers are of 6-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 0 and the second 
number has 1. 
Since 0 < 1 
381007 is greater 
(iii) 63520 or 63250 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 5 and the second 
number has 2. 
Since 5 < 2 
63520 is greater 
Question 4. 
By making a suitable chart, compare: 
(i) 540276 and 369998 
(ii) 6983245 and 6893254 
Solution: 
(i) 540276 and 369998 
5 4 0 2 7 6 
3 6 9 9 9 8 
Clearly, both the numbers have equal number of digits i.e. 6 
And at the leftmost, the first number has 5 and the second number has 3. 
Since 5 > 3 
540276 is greater. 
(ii) 6983245 and 6893254 
6 9 8 3 2 4 5 
6 8 9 3 2 5 4 
Clearly, both the numbers have equal number of digits i.e. 7 
And at the leftmost, both have the same digit i.e. 6 
And at the second place from the left, the first number has 9 and the second number 
has 8. 
Since 9 > 8 
6983245 is greater. 
Question 5. 
Compare the numbers written in the following table by writing them in ascending order: 
 
5 4 3 2 9 7 2 
2 3 1 0 6 2 9 3 
 
5 2 2 3 7 9 1 
2 3 1 8 2 6 3 4 
5 4 3 4 4 7 8 2 
Solution: 
The given number in ascending order are as : 
54344782 > 243182634 > 23106293 > 5432972> 5223791 
5 4 3 4 4 7 8 2 
2 3 1 8 2 6 3 4 
2 3 1 0 6 2 9 3 
 
5 4 3 2 9 7 2 
 
5 2 2 3 7 9 1 
Page 4


IMPORTANT POINTS 
1. Place-Value (Local Value) : The place value (Local-value) of a digit depends 
upon the position, it occupies in the number: 
For example : 
In the number 6453 
the place value of 6 is 6 thousand = 6 x 1000 = 6000 
the place value of 4 is 4 hundred = 4 x 100 = 400 
the place value of 5 is 5 ten = 5 x 10 = 50 
the place value of 3 is 3 one = 3 x 1 = 3 
2. Face-Value (True-Value) : Each digit in a number has a fixed value, regardless to 
its position in the number 
For Example : 
In the above number 6453 
Face value of 6 is 6, 4 is 4, 5 is 5 and 3 is 3 
3. An Abstract Number : Which does not refer to any particular unit e.g., 3, 5, 9. 
4. A Concrete Number : Which refers to particular unit e.g., 3 boys, 5 girls, 9 rooms 
etc. 
The smallest (least) one digit Number is 1. 
The largest (greatest) one digit number is 9. 
EXERCISE 1(A) 
Question 1. 
Which is greater ? 
(i) 537 or 98 
(ii) 2428 or 529 
(iii) 2, 59, 467 or 10, 35, 729 
Solution: 
(i) 537 or 98 
Since 537 is three digit number and 98 is two digit number. 
Hence 537 > 98 and 537 is greater 
(ii) 2428 or 529 
Since 2498 is four digit number and 529 is three digit number. 
2498 > 529 ; 2498 is greater 
(iii) 2, 59, 467 or 10, 35, 729 
Since 10, 35, 729 is seven digit number and 2, 59, 467 is six digit number 
10, 35, 729 > 2, 59, 467 ; 10, 35, 729 is greater 
Question 2. 
Which is smaller ? 
(i) 428 or 437 
(ii) 2497 or 2597 
(iii) 3297 or 3596 
Solution: 
(i) 428 or 437 
We observe that both the numbers are of three-digits. 
And at the leftmost, both the number have same digit i.e. 4. But at the second place 
from the left, the first, number has 2 and the second number has 3. 
Since 2 < 3 
437 is greater 
(ii) 2497 or 2597 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
2597 is greater 
(iii) 3297 or 3596 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
3596 is greater 
Question 3. 
Which is greater ? 
(i) 45293 or 45427 
(ii) 380362 or 381007 
(iii) 63520 or 63250 
Solution: 
(i) 45293 or 45427 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 2 and the second 
number has 4. 
Since 2 < 4 
45427 is greater 
(ii) 380362 or 381007 
We observe that both the numbers are of 6-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 0 and the second 
number has 1. 
Since 0 < 1 
381007 is greater 
(iii) 63520 or 63250 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 5 and the second 
number has 2. 
Since 5 < 2 
63520 is greater 
Question 4. 
By making a suitable chart, compare: 
(i) 540276 and 369998 
(ii) 6983245 and 6893254 
Solution: 
(i) 540276 and 369998 
5 4 0 2 7 6 
3 6 9 9 9 8 
Clearly, both the numbers have equal number of digits i.e. 6 
And at the leftmost, the first number has 5 and the second number has 3. 
Since 5 > 3 
540276 is greater. 
(ii) 6983245 and 6893254 
6 9 8 3 2 4 5 
6 8 9 3 2 5 4 
Clearly, both the numbers have equal number of digits i.e. 7 
And at the leftmost, both have the same digit i.e. 6 
And at the second place from the left, the first number has 9 and the second number 
has 8. 
Since 9 > 8 
6983245 is greater. 
Question 5. 
Compare the numbers written in the following table by writing them in ascending order: 
 
5 4 3 2 9 7 2 
2 3 1 0 6 2 9 3 
 
5 2 2 3 7 9 1 
2 3 1 8 2 6 3 4 
5 4 3 4 4 7 8 2 
Solution: 
The given number in ascending order are as : 
54344782 > 243182634 > 23106293 > 5432972> 5223791 
5 4 3 4 4 7 8 2 
2 3 1 8 2 6 3 4 
2 3 1 0 6 2 9 3 
 
5 4 3 2 9 7 2 
 
5 2 2 3 7 9 1 
Question 6. 
Use table form to compare the numbers in descending order : 5,43,287; 54,82,900; 
27,32,940; 43,877 ; 78,396 and 4,999 
Solution: 
The given numbers in descending order are as : 
   
4 9 9 9 
  
4 3 8 7 7 
  
7 8 3 9 6 
 
5 4 3 2 8 7 
2 7 3 2 9 4 0 
5 4 8 2 9 0 0 
4, 999 < 43, 877 < 78, 396 < 5, 43, 287 < 27, 32, 940 < 54, 82, 900 
Question 7. 
Find the smallest and the greatest numbers in each case given below: 
(i) 983, 5754, 84 and 5942 
(ii) 32849, 53628, 5499 and 54909. 
Solution: 
(i) 983, 5754, 84 ahd 5942 
Since 84 has the least number of digits. 
84 is the least smallest whereas 5754 and 5942 have the maximum number of digits. 
Out of 5754 and 5942, 5942 is greater. 
5942 is the greatest and 84 is the smallest. 
(ii) 32849, 53628, 5499 and 54909. 
Since 5499 has the least number of digits. 
5499 is the smallest 
Whereas 54909 and 53628 have the maximum number of digits. Out of 54909 and 
53628, 54909 is greater. 
54909 is the greatest and 5499 is the smallest 
Question 8. 
Form the greatest and the smallest 4 digit numbers using the given digits without 
repetition 
(i) 3, 7, 2 and 5 
(ii) 6, 1, 4 and 9 
(iii) 7, 0, 4 and 2 
(iv) 1, 8, 5 and 3 
(v) 9, 6, 0 and 7 
Solution: 
(i) The given digits are 3, 7, 2 and 5 
(a) The greatest 4-digit number = 7532 
(b) and the smallest 4-digit number = 2357 
(ii) The digits are given : 6, 1, 4 and 9 
Page 5


IMPORTANT POINTS 
1. Place-Value (Local Value) : The place value (Local-value) of a digit depends 
upon the position, it occupies in the number: 
For example : 
In the number 6453 
the place value of 6 is 6 thousand = 6 x 1000 = 6000 
the place value of 4 is 4 hundred = 4 x 100 = 400 
the place value of 5 is 5 ten = 5 x 10 = 50 
the place value of 3 is 3 one = 3 x 1 = 3 
2. Face-Value (True-Value) : Each digit in a number has a fixed value, regardless to 
its position in the number 
For Example : 
In the above number 6453 
Face value of 6 is 6, 4 is 4, 5 is 5 and 3 is 3 
3. An Abstract Number : Which does not refer to any particular unit e.g., 3, 5, 9. 
4. A Concrete Number : Which refers to particular unit e.g., 3 boys, 5 girls, 9 rooms 
etc. 
The smallest (least) one digit Number is 1. 
The largest (greatest) one digit number is 9. 
EXERCISE 1(A) 
Question 1. 
Which is greater ? 
(i) 537 or 98 
(ii) 2428 or 529 
(iii) 2, 59, 467 or 10, 35, 729 
Solution: 
(i) 537 or 98 
Since 537 is three digit number and 98 is two digit number. 
Hence 537 > 98 and 537 is greater 
(ii) 2428 or 529 
Since 2498 is four digit number and 529 is three digit number. 
2498 > 529 ; 2498 is greater 
(iii) 2, 59, 467 or 10, 35, 729 
Since 10, 35, 729 is seven digit number and 2, 59, 467 is six digit number 
10, 35, 729 > 2, 59, 467 ; 10, 35, 729 is greater 
Question 2. 
Which is smaller ? 
(i) 428 or 437 
(ii) 2497 or 2597 
(iii) 3297 or 3596 
Solution: 
(i) 428 or 437 
We observe that both the numbers are of three-digits. 
And at the leftmost, both the number have same digit i.e. 4. But at the second place 
from the left, the first, number has 2 and the second number has 3. 
Since 2 < 3 
437 is greater 
(ii) 2497 or 2597 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
2597 is greater 
(iii) 3297 or 3596 
We observe that both the numbers are of four digits. 
And at the leftmost, both the numbers have same digit i.e. 2. But at the second place 
from the left, the first number has 4 and the second number has 5. 
Since 4 < 5 
3596 is greater 
Question 3. 
Which is greater ? 
(i) 45293 or 45427 
(ii) 380362 or 381007 
(iii) 63520 or 63250 
Solution: 
(i) 45293 or 45427 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 2 and the second 
number has 4. 
Since 2 < 4 
45427 is greater 
(ii) 380362 or 381007 
We observe that both the numbers are of 6-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 0 and the second 
number has 1. 
Since 0 < 1 
381007 is greater 
(iii) 63520 or 63250 
We observe that both the numbers are of 5-digits. 
And at the digits at leftmost and second place from the left are same. 
But the digits at the third place from the left are different, the first number has 5 and the second 
number has 2. 
Since 5 < 2 
63520 is greater 
Question 4. 
By making a suitable chart, compare: 
(i) 540276 and 369998 
(ii) 6983245 and 6893254 
Solution: 
(i) 540276 and 369998 
5 4 0 2 7 6 
3 6 9 9 9 8 
Clearly, both the numbers have equal number of digits i.e. 6 
And at the leftmost, the first number has 5 and the second number has 3. 
Since 5 > 3 
540276 is greater. 
(ii) 6983245 and 6893254 
6 9 8 3 2 4 5 
6 8 9 3 2 5 4 
Clearly, both the numbers have equal number of digits i.e. 7 
And at the leftmost, both have the same digit i.e. 6 
And at the second place from the left, the first number has 9 and the second number 
has 8. 
Since 9 > 8 
6983245 is greater. 
Question 5. 
Compare the numbers written in the following table by writing them in ascending order: 
 
5 4 3 2 9 7 2 
2 3 1 0 6 2 9 3 
 
5 2 2 3 7 9 1 
2 3 1 8 2 6 3 4 
5 4 3 4 4 7 8 2 
Solution: 
The given number in ascending order are as : 
54344782 > 243182634 > 23106293 > 5432972> 5223791 
5 4 3 4 4 7 8 2 
2 3 1 8 2 6 3 4 
2 3 1 0 6 2 9 3 
 
5 4 3 2 9 7 2 
 
5 2 2 3 7 9 1 
Question 6. 
Use table form to compare the numbers in descending order : 5,43,287; 54,82,900; 
27,32,940; 43,877 ; 78,396 and 4,999 
Solution: 
The given numbers in descending order are as : 
   
4 9 9 9 
  
4 3 8 7 7 
  
7 8 3 9 6 
 
5 4 3 2 8 7 
2 7 3 2 9 4 0 
5 4 8 2 9 0 0 
4, 999 < 43, 877 < 78, 396 < 5, 43, 287 < 27, 32, 940 < 54, 82, 900 
Question 7. 
Find the smallest and the greatest numbers in each case given below: 
(i) 983, 5754, 84 and 5942 
(ii) 32849, 53628, 5499 and 54909. 
Solution: 
(i) 983, 5754, 84 ahd 5942 
Since 84 has the least number of digits. 
84 is the least smallest whereas 5754 and 5942 have the maximum number of digits. 
Out of 5754 and 5942, 5942 is greater. 
5942 is the greatest and 84 is the smallest. 
(ii) 32849, 53628, 5499 and 54909. 
Since 5499 has the least number of digits. 
5499 is the smallest 
Whereas 54909 and 53628 have the maximum number of digits. Out of 54909 and 
53628, 54909 is greater. 
54909 is the greatest and 5499 is the smallest 
Question 8. 
Form the greatest and the smallest 4 digit numbers using the given digits without 
repetition 
(i) 3, 7, 2 and 5 
(ii) 6, 1, 4 and 9 
(iii) 7, 0, 4 and 2 
(iv) 1, 8, 5 and 3 
(v) 9, 6, 0 and 7 
Solution: 
(i) The given digits are 3, 7, 2 and 5 
(a) The greatest 4-digit number = 7532 
(b) and the smallest 4-digit number = 2357 
(ii) The digits are given : 6, 1, 4 and 9 
(a) The greatest 4-digit number = 9641 
(b) and the smallest 4-digit number = 1469 
(iii) The digits are given 7, 0, 4 and 2 
(a) The greatest 4-digit number = 7420 
(b) The smallest 4-digit number = 2047 
(iv) the digits are given 1, 8, 5 and 3 
(a) The greatest 4-digit number = 8531 
(b) and the smallest 4-digit number =1358 
(v) The digits are given 9, 6, 0 and 7 
(a) The greatest 4-digit number = 9760 
(b) and the smallest 4-digit number = 6079 
Question 9. 
Form the greatest and the smallest 3-digit numbers using any three different digits with 
the condition that digit 6 is always at the unit (one’s) place. 
Solution: 
The condition for 3-digit number of three different digits is that 6 is at the ones place 
The greatest 3-digit number will be 986 and the smallest 3-digit number will be 106 
Question 10. 
Form the greatest and the smallest 4-digit number using any four different digits with the 
condition that digit 5 is always at ten’s place. 
Solution: 
The condition for 4-digit number of four different digits is that 5 is always at its tens 
place 
The greatest 4-digit number will be 9857 and the smallest 4-digit number will be 1052 
Question 11. 
Fill in the blanks : 
(i) The largest number of 5-digit is …………… and the smallest number of 6-digit is 
……………. 
(ii) The difference between the smallest number of four digits and the largest number of 
three digits = …………. – ………….. = ………….. 
(iii) The sum (addition) of the smallest number of three digit and the largest number of 
two digit = ………… + …………= …………. 
(iv) On adding one to the largest five digit number, we get ……………. which is the 
smallest ……………… digit number. 
(v) On subtracting one from the smallest four digit number, we get ……………… which 
is the ……………. three digit number. 
Solution: 
(i) The largest number of 5-digit is 99999 and the smallest number of 6-digit is 100000 
(ii) The difference between the smallest number of four digits and the largest number of 
three digits = 1000– 999 = 1 
(iii) The sum (addition) of the smallest number of three digit and the largest number of 
two digit = 100 + 99= 199