One-Digit Numbers and Two-Digit Numbers

DIGITS:

Number 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 are called Digits.

We use these digits to make more numbers.


One-Digit Numbers:

Number 1 to 9 are One-digit numbers.


Two-Digit Numbers:

Numbers 10 to 99 are Two-digit numbers.


Three-Digit Numbers:

The number 100 is a Three-digit number.

Forming Two-Digit Numbers Using the Given Digits

Numbers can be formed by using these digits:

Forming Two-Digit Numbers

Count and write the number of digits listed above.

Yes, these digits are 10.

Also, these digits are ten one-digit numbers.


Let us form as many two-digit numbers by using the digits 5 and 7 as we can.

We can write 57 and 75.


Can you form some other two-digit numbers using the digits 5 and 7?

Yes, these can be 55 and 77 also.

So, all possible two-digit numbers formed by using the digits 5 and 7 are:
57, 75, 55, 77

These are in all 4 numbers.

Out of these 4 numbers, 55 and 77 have the same digit repeating.


Numbers can be formed with or without the repetition of digits.


Let us read these examples.

1. Possible two-digit numbers formed by using the digits 1 and 7 without repetition are 17 and 71.

2. With digits 5 and 9 we may form the numbers 59, 95.

3. With the digit 0 and the digit 3, only the number 30 is formed.

The number 03 is not a two-digit number.


Let us form two-digit numbers using given digits with or without repetition.

I. Given digits 2 and 6.

● Two-digit numbers without repetition: 26, 62

● Two-digit numbers with repetition of digits: 22, 66


II. Given digits 0 and 4.

● Two-digit numbers without repetition: 40 (Only one number)
● Two-digit numbers with repetition of digits: 44 (Only one number)


Now complete the following sentences.

1. In all, there are __________ one-digit numbers.

2. The greatest one-digit number is __________ .

3. The number of two-digit numbers from 10 to 19 is __________ .

4. The number of two-digit numbers from 20 to 39 is __________ .

5. The number of two-digit numbers from 40 to 69 is __________ .

6. The number of two-digit numbers from 70 to 99 is __________ .

7. The number of two-digit numbers from 1 to 99 is __________ .

8. The smallest two-digit number is __________ .

9. The greatest two-digit number is __________ .

10. Two-digit numbers with repetition are 11, 22, __________ 99.


Answer:

1. 9

2. 9

3. 10

4. 20

5. 30

6. 30

7. 90

8. 10

9. 99

10. 33, 44, 55, 66, 77, 88

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