How many 7- digit numbers are there?

Answer

To find how many 7-digit numbers there are, we can follow these steps:

1. **Identify the smallest 7-digit number**:
The smallest 7-digit number is 1,000,000.

2. **Identify the largest 7-digit number**:
The largest 7-digit number is 9,999,999.

3. **Calculate the total number of 7-digit numbers**:
To find the total number of 7-digit numbers, we can use the formula:
\[ \text{Total 7-digit numbers} = \text{Largest 7-digit number} - \text{Smallest 7-digit number} + 1 \]
Substituting the values:
\[ \text{Total 7-digit numbers} = 9,999,999 - 1,000,000 + 1 \]

4. **Perform the subtraction**:
\[ 9,999,999 - 1,000,000 = 8,999,999 \]

5. **Add 1 to the result**:
\[ 8,999,999 + 1 = 9,000,000 \]

Thus, the total number of 7-digit numbers is **9,000,000**.