How many numbers are there with:
9-digits

Answer

To find how many 9-digit numbers there are, we can follow these steps:

### Step 1: Identify the smallest and largest 9-digit numbers
- The smallest 9-digit number is **10,00,00,000** (or 10 crore).
- The largest 9-digit number is **99,99,99,999**.

### Step 2: Calculate the total number of 9-digit numbers
- To find the total count of 9-digit numbers, we can use the formula:
\[ \text{Total 9-digit numbers} = \text{Largest 9-digit number} - \text{Smallest 9-digit number} + 1 \]
- Plugging in the values:
\[ \text{Total 9-digit numbers} = 99,99,99,999 - 10,00,00,000 + 1 \]

### Step 3: Perform the subtraction
- First, we subtract the smallest number from the largest:
\[ 99,99,99,999 - 10,00,00,000 = 89,99,99,999 \]

### Step 4: Add 1 to the result
- Now, we add 1 to the result from the previous step:
\[ 89,99,99,999 + 1 = 90,00,00,000 \]

### Conclusion
- Therefore, the total number of 9-digit numbers is **90,00,00,000** (or 90 crore).