90102712 ÷ 831 
The aim is to understand the frequency of 831 in 90102712.

Going ahead to step 1:
9 divided by 831 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 831

On to step 2:
831 can be fit into 90 0 times, resulting in a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Take the next digit (1) from the dividend and append it to 90, then repeat: 901 / 831

On to step 3:
If we divide 901 by 831, we get 1 and a remainder of 70.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 831 from 901 and we're left with 70.
Append the next digit (0) from the dividend to 70 and continue with: 700 / 831

Going ahead to step 4:
831 can be fit into 700 0 times, resulting in a remainder of 700.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
The remainder is 700 after subtracting 0 from 700.
Bring next digit (2) of the dividend behind the 700 and repeat the process: 7002 / 831

Step 5:
If we divide 7002 by 831, we get 8 and a remainder of 354.
Put 8 as the next digit of the answer. 
Result so far: 108.0
Deduct 6648 from 7002 and we're left with 354.
Grab the next digit (7) from the dividend, add it to 354, then carry on: 3547 / 831

Let's proceed to step 6:
When dividing 3547 by 831, we get 4 with a remainder of 223.
Write down 4 as next digit of the result. 
Result so far: 1084.0
Subtract 3324 from 3547 to get 223.
Append the next digit (1) from the dividend to 223 and continue with: 2231 / 831

Step 7:
2231 divided by 831 is 2 with a remainder of 569.
Put 2 as the next digit of the answer. 
Result so far: 10842.0
If we take 1662 away from 2231, we end up with 569.
Bring next digit (2) of the dividend behind the 569 and repeat the process: 5692 / 831

Let's proceed to step 8:
831 goes into 5692 6 times with a remainder of 706.
The next digit of our result is 6. 
Result so far: 108426.0
If we subtract 4986 from 5692, we get 706.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7060, and continue the process.

On to step 9:
831 can be fit into 7060 8 times, resulting in a remainder of 412.
The next digit of our result is 8. 
Result so far: 108426.8
Deduct 6648 from 7060 and we're left with 412.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4120, and continue the process.

Moving on to step 10:
4120 divided by 831 is 4 with a remainder of 796.
Put 4 as the next digit of the answer. 
Result so far: 108426.84
Deduct 3324 from 4120 and we're left with 796.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7960, and continue the process.

Moving on to step 11:
When dividing 7960 by 831, we get 9 with a remainder of 481.
Put 9 as the next digit of the answer. 
Result so far: 108426.849
The remainder is 481 after subtracting 7479 from 7960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4810, and continue the process.

On to step 12:
The number 831 fits into 4810 5 times, leaving a remainder of 655.
Write down 5 as next digit of the result. 
Result so far: 108426.8495
If we take 4155 away from 4810, we end up with 655.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6550, and continue the process.

Advancing to step 13:
6550 divided by 831 is 7 with a remainder of 733.
The number 7 becomes the next digit in our result. 
Result so far: 108426.84957
If we take 5817 away from 6550, we end up with 733.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7330, and continue the process.

Let's proceed to step 14:
7330 divided by 831 is 8 with a remainder of 682.
Record the quotient 8 as the next digit in the result. 
Result so far: 108426.849578
Subtracting 6648 from 7330 leaves us with 682.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6820, and continue the process.

Going ahead to step 15:
831 goes into 6820 8 times with a remainder of 172.
The number 8 becomes the next digit in our result. 
Result so far: 108426.8495788
If we take 6648 away from 6820, we end up with 172.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1720, and continue the process.

The final result is 108426.8495788 with a remainder of 1.72e-06.