Grade 2 Math Digits and Numbers
Digits And Numbers
What is a Digit?
A digit or numerical digit
is a single symbol that is used alone or with other symbols to represent a
number in the numeral system. There are 10 digits. They are: 0,1,2,3,4,5,6,7,8,9.
What is a Number?
A number is a mathematical
expression that is formed by a digit or more digits used to count measure and
label.
Example:
The natural numbers: 1,2,3, and so forth.
What is Natural Number?
The counting number (1 to
infinity) is called natural number. Such as: 1,2,3,4,5,6,7,8,9,10,11,………….
Notable Information about
Digit and Number:
(i) One digit smallest
number:
0 is the one digit smallest
number (In the case of whole numbers)
1 is the one digit
smallest number (In the case of Natural numbers)
(ii) One digit greatest
number:
9 is the one digit
greatest number.
(iii) Two digits smallest
number:
10 is the two digits
smallest number.
(iv) Two digits greatest
number:
99 is the two digits
greatest number.
(v) Three digits smallest
number:
100 is the three digits
smallest number.
(vi) Three digits greatest
number:
999 is the three digits
greatest number.
So, here we find a pattern,
That is as like as below table:
|
Smallest
Number |
Greatest
Number |
Condition
|
|
10
|
99
|
For
2 digits
|
|
100
|
999
|
For
3 digits
|
|
1000
|
999
|
For
4 digits
|
|
10000
|
9999
|
For
5 digits
|
3 digits greatest number =9 is in 3 times = 999
4 digits greatest number =
9 is in 4 times = 9999
So, n digit greatest
number = 9 is in n times.
3 digit smallest number =
1 after 2 zeros = 100
4 digit smallest number =
1 after 3 zeros = 1000
So, n digits smallest
number = 1 after (n-1) zeros
1. Fill in the blanks.
(a) 9 digits smallest
number is ________.
(b) 8 digits greatest
number is ________.
(c) 7 digits greatest
number is ________.
(d) 2 digits smallest
number is _____ than 1 digit greatest number.
(e) 5 digits smallest
number is ______, greatest number is ______.
(f) 1,2,3,4,5….. are
______ numbers.
Answer:
(a) 100000000
(b) 99999999
(c) 9999999
(d) bigger [Two digits smallest number: 10 and 1 digit
greatest number: 9. And 10>9]
(e) 10000, 99999
(f) natural
2. True or false.
Write true or false and re-write the correct answer.
(a) 2 digits greatest
number is 100.
(b) 3 digits smallest
number 100.
(c) Total digits are 9 in
number.
(d) 3 digits smallest
number – 2 digits greatest number = 1.
(e) 9 digits greatest
number is 900000000.
Answer:
(a) False
Correct Answer: 2 digits
greatest number is 99.
(b) True
(c) False
Correct Answer: Total
digits are 10 in number.
(d) True
[3 digits smallest number –
2 digits greatest number
= 100 – 99
= 1]
(e) False
Correct Answer: 9 digits greatest number is 999999999.