Understanding the Range of 3-Digit Numbers
To determine how many 3-digit numbers exist between 20 and 120, we first need to clarify the limits of this range.
Identifying 3-Digit Numbers
- A 3-digit number is any number from 100 to 999.
- Therefore, the lowest 3-digit number is 100, and the highest is 999.
Defining the Range
- We are interested in the numbers that fall between 20 and 120.
- However, since we are looking for 3-digit numbers, we can only count those starting from 100.
Counting the 3-Digit Numbers
- The first 3-digit number is 100.
- The last 3-digit number that we can consider within the limit of 120 is 120 itself.
Calculating the Total
- Now, we find the total number of 3-digit numbers from 100 to 120:
- The numbers are: 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, and 120.
- This gives us a total of 21 numbers.
Conclusion
- Therefore, the total number of 3-digit numbers between 20 and 120 is 21.
This explanation helps us see how we can effectively determine the count of specific types of numbers within defined ranges.