We're dividing 631386 by 51 
Let's see how many times 51 fits into 631386.

Moving on to step 1:
51 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (3) from the dividend, add it to 6, then carry on: 63 / 51

Step 2:
51 can be fit into 63 1 times, resulting in a remainder of 12.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 51 from 63 leaves us with 12.
Grab the next digit (1) from the dividend, add it to 12, then carry on: 121 / 51

Advancing to step 3:
51 can be fit into 121 2 times, resulting in a remainder of 19.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtract 102 from 121 to get 19.
Bring next digit (3) of the dividend behind the 19 and repeat the process: 193 / 51

Step 4:
If we divide 193 by 51, we get 3 and a remainder of 40.
Use 3 as the next digit of our solution. 
Result so far: 123.0
If we take 153 away from 193, we end up with 40.
Grab the next digit (8) from the dividend, add it to 40, then carry on: 408 / 51

Step 5:
51 can be fit into 408 8 times, resulting in a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 1238.0
Subtract 408 from 408 to get 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 51

Advancing to step 6:
6 divided by 51 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 12380.0
If we subtract 0 from 6, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 7:
51 can be fit into 60 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 12380.1
Deduct 51 from 60 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 8:
If we divide 90 by 51, we get 1 and a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 12380.11
If we take 51 away from 90, 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.

The final outcome is 12380.11, with a leftover of 0.039.