We look at the division of 309812 by 39 
We want to divide 309812 by 39.

On to step 1:
39 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 39

Moving on to step 2:
If we divide 30 by 39, we get 0 and a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 30 and we're left with 30.
Bring next digit (9) of the dividend behind the 30 and repeat the process: 309 / 39

Step 3:
If we divide 309 by 39, we get 7 and a remainder of 36.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 273 away from 309, we end up with 36.
Bring next digit (8) of the dividend behind the 36 and repeat the process: 368 / 39

Going ahead to step 4:
If we divide 368 by 39, we get 9 and a remainder of 17.
Use 9 as the next digit of our solution. 
Result so far: 79.0
If we take 351 away from 368, we end up with 17.
Bring next digit (1) of the dividend behind the 17 and repeat the process: 171 / 39

Going ahead to step 5:
When dividing 171 by 39, we get 4 with a remainder of 15.
Write down 4 as next digit of the result. 
Result so far: 794.0
Deduct 156 from 171 and we're left with 15.
Grab the next digit (2) from the dividend, add it to 15, then carry on: 152 / 39

Advancing to step 6:
If we divide 152 by 39, we get 3 and a remainder of 35.
Record the quotient 3 as the next digit in the result. 
Result so far: 7943.0
Subtract 117 from 152 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 7:
When dividing 350 by 39, we get 8 with a remainder of 38.
Write down 8 as next digit of the result. 
Result so far: 7943.8
The remainder is 38 after subtracting 312 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 8:
If we divide 380 by 39, we get 9 and a remainder of 29.
The number 9 becomes the next digit in our result. 
Result so far: 7943.89
Subtracting 351 from 380 leaves us with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 9:
39 can be fit into 290 7 times, resulting in a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 7943.897
If we take 273 away from 290, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 10:
170 divided by 39 is 4 with a remainder of 14.
The next digit of our result is 4. 
Result so far: 7943.8974
If we subtract 156 from 170, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 11:
39 can be fit into 140 3 times, resulting in a remainder of 23.
The number 3 becomes the next digit in our result. 
Result so far: 7943.89743
The remainder is 23 after subtracting 117 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 12:
39 goes into 230 5 times with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 7943.897435
Deduct 195 from 230 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 13:
39 can be fit into 350 8 times, resulting in a remainder of 38.
The next digit of our result is 8. 
Result so far: 7943.8974358
Subtract 312 from 350 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 14:
39 can be fit into 380 9 times, resulting in a remainder of 29.
Write down 9 as next digit of the result. 
Result so far: 7943.89743589
The remainder is 29 after subtracting 351 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 7943.89743589 with a remainder of 2.9e-08.