How many 7-digit numbers are there?

Answer

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

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

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

### Step 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 we identified:
\[ \text{Total 7-digit numbers} = 9,999,999 - 1,000,000 + 1 \]

### Step 4: Perform the subtraction
Now, let's perform the subtraction:
\[ 9,999,999 - 1,000,000 = 8,999,999 \]

### Step 5: Add 1 to the result
Now, we add 1 to the result from the previous step:
\[ 8,999,999 + 1 = 9,000,000 \]

### Final Answer
Therefore, the total number of 7-digit numbers is **9,000,000**.

---