We're dividing 868721 by 51 
Let's see how many times 51 fits into 868721.

Going ahead to step 1:
51 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 51

Let's proceed to step 2:
The number 51 fits into 86 1 times, leaving a remainder of 35.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 51 from 86 to get 35.
Fetch the next digit (8) from the dividend, attach it to 35 and continue: 358 / 51

Step 3:
If we divide 358 by 51, we get 7 and a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
The remainder is 1 after subtracting 357 from 358.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 51

Moving on to step 4:
If we divide 17 by 51, we get 0 and a remainder of 17.
Use 0 as the next digit of our solution. 
Result so far: 170.0
Deduct 0 from 17 and we're left with 17.
Take the next digit (2) from the dividend and append it to 17, then repeat: 172 / 51

Moving on to step 5:
The number 51 fits into 172 3 times, leaving a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 1703.0
If we subtract 153 from 172, we get 19.
Take the next digit (1) from the dividend and append it to 19, then repeat: 191 / 51

Step 6:
51 can be fit into 191 3 times, resulting in a remainder of 38.
Write down 3 as next digit of the result. 
Result so far: 17033.0
Subtract 153 from 191 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 7:
When dividing 380 by 51, we get 7 with a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 17033.7
Deduct 357 from 380 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 8:
230 divided by 51 is 4 with a remainder of 26.
The number 4 becomes the next digit in our result. 
Result so far: 17033.74
If we subtract 204 from 230, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 9:
260 divided by 51 is 5 with a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 17033.745
The remainder is 5 after subtracting 255 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
If we divide 50 by 51, we get 0 and a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 17033.745
If we take 0 away from 50, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 11:
If we divide 500 by 51, we get 9 and a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 17033.74509
Subtract 459 from 500 to get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Going ahead to step 12:
51 goes into 410 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 17033.745098
Subtract 408 from 410 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 13:
20 divided by 51 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 17033.745098
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 14:
51 goes into 200 3 times with a remainder of 47.
The number 3 becomes the next digit in our result. 
Result so far: 17033.74509803
Subtracting 153 from 200 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

After the division, we end up with 17033.74509803 and a remainder of 4.7e-08.