What will be the difference between the greatest 6-digit number and the greatest 5-digit number?

Options

A. 100000
B. 100001
C. 99999
D. 900000

Answer

To find the difference between the greatest 6-digit number and the greatest 5-digit number, we will follow these steps:

### Step 1: Identify the greatest 6-digit number
The greatest 6-digit number is 999999.

### Step 2: Identify the greatest 5-digit number
The greatest 5-digit number is 99999.

### Step 3: Set up the subtraction
We need to calculate the difference between the greatest 6-digit number and the greatest 5-digit number:
\[ \text{Difference} = \text{Greatest 6-digit number} - \text{Greatest 5-digit number} \]
So, we set it up as:
\[ 999999 - 99999 \]

### Step 4: Perform the subtraction
Now we will subtract:
```
999999
- 99999
__________
```
Aligning the numbers, we can perform the subtraction:
- Start from the rightmost digit:
- 9 - 9 = 0
- 9 - 9 = 0
- 9 - 9 = 0
- 9 - 9 = 0
- 9 - 0 = 9
- The leftmost digit remains 9.

So, the result of the subtraction is:
\[ 999999 - 99999 = 900000 \]

### Step 5: State the final answer
The difference between the greatest 6-digit number and the greatest 5-digit number is **900000**.

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