866487 divided by 51 
We want to divide 866487 by 51.

Moving on to step 1:
When dividing 8 by 51, we get 0 with 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.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 51

Going ahead to step 2:
51 goes into 86 1 times with a remainder of 35.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 35 after subtracting 51 from 86.
Grab the next digit (6) from the dividend, add it to 35, then carry on: 356 / 51

Moving on to step 3:
51 can be fit into 356 6 times, resulting in a remainder of 50.
Put 6 as the next digit of the answer. 
Result so far: 16.0
Deduct 306 from 356 and we're left with 50.
Include the next digit (4) from the dividend after 50, then repeat: 504 / 51

Let's proceed to step 4:
51 goes into 504 9 times with a remainder of 45.
Put 9 as the next digit of the answer. 
Result so far: 169.0
Deduct 459 from 504 and we're left with 45.
Include the next digit (8) from the dividend after 45, then repeat: 458 / 51

On to step 5:
51 goes into 458 8 times with a remainder of 50.
Put 8 as the next digit of the answer. 
Result so far: 1698.0
Deduct 408 from 458 and we're left with 50.
Bring next digit (7) of the dividend behind the 50 and repeat the process: 507 / 51

On to step 6:
51 can be fit into 507 9 times, resulting in a remainder of 48.
Write down 9 as next digit of the result. 
Result so far: 16989.0
Subtract 459 from 507 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 7:
The number 51 fits into 480 9 times, leaving a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 16989.9
Deduct 459 from 480 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 8:
When dividing 210 by 51, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 16989.94
The remainder is 6 after subtracting 204 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 9:
60 divided by 51 is 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 16989.941
The remainder is 9 after subtracting 51 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 10:
51 goes into 90 1 times with a remainder of 39.
The next digit of our result is 1. 
Result so far: 16989.9411
Subtract 51 from 90 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final result is 16989.9411 with a remainder of 0.00039.