81200517 ÷ 939 
We want to figure out the number of times 81200517 can be divided by 939.

Step 1:
The number 939 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 939

Let's proceed to step 2:
81 divided by 939 is 0 with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 81 to get 81.
Append the next digit (2) from the dividend to 81 and continue with: 812 / 939

Advancing to step 3:
939 goes into 812 0 times with a remainder of 812.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 812 after subtracting 0 from 812.
Include the next digit (0) from the dividend after 812, then repeat: 8120 / 939

Step 4:
939 goes into 8120 8 times with a remainder of 608.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 608 after subtracting 7512 from 8120.
Take the next digit (0) from the dividend and append it to 608, then repeat: 6080 / 939

Advancing to step 5:
The number 939 fits into 6080 6 times, leaving a remainder of 446.
The number 6 becomes the next digit in our result. 
Result so far: 86.0
If we take 5634 away from 6080, we end up with 446.
Fetch the next digit (5) from the dividend, attach it to 446 and continue: 4465 / 939

Advancing to step 6:
4465 divided by 939 is 4 with a remainder of 709.
Use 4 as the next digit of our solution. 
Result so far: 864.0
The remainder is 709 after subtracting 3756 from 4465.
Fetch the next digit (1) from the dividend, attach it to 709 and continue: 7091 / 939

On to step 7:
The number 939 fits into 7091 7 times, leaving a remainder of 518.
Use 7 as the next digit of our solution. 
Result so far: 8647.0
Deduct 6573 from 7091 and we're left with 518.
Grab the next digit (7) from the dividend, add it to 518, then carry on: 5187 / 939

Moving on to step 8:
When dividing 5187 by 939, we get 5 with a remainder of 492.
Record the quotient 5 as the next digit in the result. 
Result so far: 86475.0
Subtract 4695 from 5187 to get 492.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4920, and continue the process.

Step 9:
939 goes into 4920 5 times with a remainder of 225.
Use 5 as the next digit of our solution. 
Result so far: 86475.5
If we subtract 4695 from 4920, we get 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Going ahead to step 10:
939 can be fit into 2250 2 times, resulting in a remainder of 372.
Put 2 as the next digit of the answer. 
Result so far: 86475.52
If we subtract 1878 from 2250, we get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Let's proceed to step 11:
If we divide 3720 by 939, we get 3 and a remainder of 903.
The number 3 becomes the next digit in our result. 
Result so far: 86475.523
Deduct 2817 from 3720 and we're left with 903.
Since there are no more digits in the dividend, we add a zero to the remainder making it 9030, and continue the process.

Let's proceed to step 12:
939 can be fit into 9030 9 times, resulting in a remainder of 579.
Record the quotient 9 as the next digit in the result. 
Result so far: 86475.5239
If we subtract 8451 from 9030, we get 579.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5790, and continue the process.

Moving on to step 13:
If we divide 5790 by 939, we get 6 and a remainder of 156.
Record the quotient 6 as the next digit in the result. 
Result so far: 86475.52396
If we subtract 5634 from 5790, we get 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Moving on to step 14:
When dividing 1560 by 939, we get 1 with a remainder of 621.
The next digit of our result is 1. 
Result so far: 86475.523961
Deduct 939 from 1560 and we're left with 621.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6210, and continue the process.

Advancing to step 15:
When dividing 6210 by 939, we get 6 with a remainder of 576.
Use 6 as the next digit of our solution. 
Result so far: 86475.5239616
The remainder is 576 after subtracting 5634 from 6210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5760, and continue the process.

Step 16:
939 goes into 5760 6 times with a remainder of 126.
Record the quotient 6 as the next digit in the result. 
Result so far: 86475.52396166
Subtract 5634 from 5760 to get 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

The final outcome is 86475.52396166, with a leftover of 1.26e-07.