We look at the division of 20513 by 39 
Let's see how many times 39 fits into 20513.

Step 1:
When dividing 2 by 39, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 39

Advancing to step 2:
If we divide 20 by 39, we get 0 and a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 20 after subtracting 0 from 20.
Bring next digit (5) of the dividend behind the 20 and repeat the process: 205 / 39

On to step 3:
When dividing 205 by 39, we get 5 with a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 195 from 205, we get 10.
Include the next digit (1) from the dividend after 10, then repeat: 101 / 39

On to step 4:
If we divide 101 by 39, we get 2 and a remainder of 23.
Write down 2 as next digit of the result. 
Result so far: 52.0
If we subtract 78 from 101, we get 23.
Take the next digit (3) from the dividend and append it to 23, then repeat: 233 / 39

Let's proceed to step 5:
39 goes into 233 5 times with a remainder of 38.
The number 5 becomes the next digit in our result. 
Result so far: 525.0
If we subtract 195 from 233, we 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.

Advancing to step 6:
The number 39 fits into 380 9 times, leaving a remainder of 29.
Record the quotient 9 as the next digit in the result. 
Result so far: 525.9
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.

Advancing to step 7:
If we divide 290 by 39, we get 7 and a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 525.97
Subtract 273 from 290 to get 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 8:
170 divided by 39 is 4 with a remainder of 14.
Record the quotient 4 as the next digit in the result. 
Result so far: 525.974
The remainder is 14 after subtracting 156 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 9:
39 can be fit into 140 3 times, resulting in a remainder of 23.
Write down 3 as next digit of the result. 
Result so far: 525.9743
Subtracting 117 from 140 leaves us 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.

Step 10:
The number 39 fits into 230 5 times, leaving a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 525.97435
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 11:
If we divide 350 by 39, we get 8 and a remainder of 38.
Put 8 as the next digit of the answer. 
Result so far: 525.974358
Subtracting 312 from 350 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 12:
380 divided by 39 is 9 with a remainder of 29.
The next digit of our result is 9. 
Result so far: 525.9743589
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.

Let's proceed to step 13:
If we divide 290 by 39, we get 7 and a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 525.97435897
Deduct 273 from 290 and we're left 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.

After the division, we end up with 525.97435897 and a remainder of 1.7e-08.