How many numbers are there with:
7-digits

Answer

To find 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 (or 10^6).

### Step 2: Identify the largest 7-digit number
The largest 7-digit number is 9,999,999 (or 10^7 - 1).

### 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, we 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:

\[ 8,999,999 + 1 = 9,000,000 \]

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

---