We look at the division of 809451 by 87 
We want to divide 809451 by 87.

On to step 1:
87 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 87

Going ahead to step 2:
When dividing 80 by 87, we get 0 with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Include the next digit (9) from the dividend after 80, then repeat: 809 / 87

Going ahead to step 3:
87 can be fit into 809 9 times, resulting in a remainder of 26.
The next digit of our result is 9. 
Result so far: 9.0
The remainder is 26 after subtracting 783 from 809.
Bring next digit (4) of the dividend behind the 26 and repeat the process: 264 / 87

Let's proceed to step 4:
The number 87 fits into 264 3 times, leaving a remainder of 3.
The next digit of our result is 3. 
Result so far: 93.0
Deduct 261 from 264 and we're left with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 87

Moving on to step 5:
When dividing 35 by 87, we get 0 with a remainder of 35.
The next digit of our result is 0. 
Result so far: 930.0
Subtracting 0 from 35 leaves us with 35.
Fetch the next digit (1) from the dividend, attach it to 35 and continue: 351 / 87

Advancing to step 6:
87 goes into 351 4 times with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 9304.0
If we subtract 348 from 351, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 7:
The number 87 fits into 30 0 times, leaving a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 9304.0
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 8:
87 can be fit into 300 3 times, resulting in a remainder of 39.
The number 3 becomes the next digit in our result. 
Result so far: 9304.03
If we take 261 away from 300, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 9:
When dividing 390 by 87, we get 4 with a remainder of 42.
Record the quotient 4 as the next digit in the result. 
Result so far: 9304.034
Subtract 348 from 390 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 10:
When dividing 420 by 87, we get 4 with a remainder of 72.
Put 4 as the next digit of the answer. 
Result so far: 9304.0344
Subtracting 348 from 420 leaves us with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

After the division, we end up with 9304.0344 and a remainder of 0.00072.