We're dividing 815469 by 51 
Let's see how many times 51 fits into 815469.

Let's proceed to step 1:
The number 51 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 51

Step 2:
51 goes into 81 1 times with a remainder of 30.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 51 from 81 and we're left with 30.
Bring next digit (5) of the dividend behind the 30 and repeat the process: 305 / 51

Advancing to step 3:
51 goes into 305 5 times with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Subtracting 255 from 305 leaves us with 50.
Bring next digit (4) of the dividend behind the 50 and repeat the process: 504 / 51

Going ahead to step 4:
If we divide 504 by 51, we get 9 and a remainder of 45.
The next digit of our result is 9. 
Result so far: 159.0
Deduct 459 from 504 and we're left with 45.
Include the next digit (6) from the dividend after 45, then repeat: 456 / 51

Let's proceed to step 5:
456 divided by 51 is 8 with a remainder of 48.
Write down 8 as next digit of the result. 
Result so far: 1598.0
Deduct 408 from 456 and we're left with 48.
Fetch the next digit (9) from the dividend, attach it to 48 and continue: 489 / 51

Moving on to step 6:
51 can be fit into 489 9 times, resulting in a remainder of 30.
The number 9 becomes the next digit in our result. 
Result so far: 15989.0
Deduct 459 from 489 and we're left 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.

On to step 7:
When dividing 300 by 51, we get 5 with a remainder of 45.
The next digit of our result is 5. 
Result so far: 15989.5
Subtract 255 from 300 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 8:
If we divide 450 by 51, we get 8 and a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 15989.58
Subtracting 408 from 450 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 9:
When dividing 420 by 51, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 15989.588
The remainder is 12 after subtracting 408 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 15989.588 and a remainder of 0.0012.