We look at the division of 72100507 by 231 
We're looking to find how many times 231 goes into 72100507.

Let's proceed to step 1:
7 divided by 231 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Append the next digit (2) from the dividend to 7 and continue with: 72 / 231

Advancing to step 2:
If we divide 72 by 231, we get 0 and a remainder of 72.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Append the next digit (1) from the dividend to 72 and continue with: 721 / 231

Moving on to step 3:
The number 231 fits into 721 3 times, leaving a remainder of 28.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 28 after subtracting 693 from 721.
Take the next digit (0) from the dividend and append it to 28, then repeat: 280 / 231

Let's proceed to step 4:
When dividing 280 by 231, we get 1 with a remainder of 49.
Put 1 as the next digit of the answer. 
Result so far: 31.0
Deduct 231 from 280 and we're left with 49.
Grab the next digit (0) from the dividend, add it to 49, then carry on: 490 / 231

On to step 5:
When dividing 490 by 231, we get 2 with a remainder of 28.
The next digit of our result is 2. 
Result so far: 312.0
Deduct 462 from 490 and we're left with 28.
Grab the next digit (5) from the dividend, add it to 28, then carry on: 285 / 231

Moving on to step 6:
231 goes into 285 1 times with a remainder of 54.
The number 1 becomes the next digit in our result. 
Result so far: 3121.0
If we take 231 away from 285, we end up with 54.
Fetch the next digit (0) from the dividend, attach it to 54 and continue: 540 / 231

On to step 7:
When dividing 540 by 231, we get 2 with a remainder of 78.
Use 2 as the next digit of our solution. 
Result so far: 31212.0
If we subtract 462 from 540, we get 78.
Bring next digit (7) of the dividend behind the 78 and repeat the process: 787 / 231

Moving on to step 8:
231 goes into 787 3 times with a remainder of 94.
Put 3 as the next digit of the answer. 
Result so far: 312123.0
The remainder is 94 after subtracting 693 from 787.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Step 9:
If we divide 940 by 231, we get 4 and a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 312123.4
The remainder is 16 after subtracting 924 from 940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 10:
160 divided by 231 is 0 with a remainder of 160.
The number 0 becomes the next digit in our result. 
Result so far: 312123.4
If we take 0 away from 160, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 11:
If we divide 1600 by 231, we get 6 and a remainder of 214.
Put 6 as the next digit of the answer. 
Result so far: 312123.406
The remainder is 214 after subtracting 1386 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2140, and continue the process.

Moving on to step 12:
2140 divided by 231 is 9 with a remainder of 61.
Put 9 as the next digit of the answer. 
Result so far: 312123.4069
If we take 2079 away from 2140, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Going ahead to step 13:
231 can be fit into 610 2 times, resulting in a remainder of 148.
The number 2 becomes the next digit in our result. 
Result so far: 312123.40692
If we subtract 462 from 610, we get 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

On to step 14:
When dividing 1480 by 231, we get 6 with a remainder of 94.
The next digit of our result is 6. 
Result so far: 312123.406926
Subtracting 1386 from 1480 leaves us with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Going ahead to step 15:
When dividing 940 by 231, we get 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 312123.4069264
Subtracting 924 from 940 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 16:
If we divide 160 by 231, we get 0 and a remainder of 160.
The number 0 becomes the next digit in our result. 
Result so far: 312123.4069264
If we take 0 away from 160, we end up with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

The final result is 312123.4069264 with a remainder of 1.6e-07.