87731973 divided by 831 
The aim is to understand the frequency of 831 in 87731973.

Moving on to step 1:
If we divide 8 by 831, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 831

Let's proceed to step 2:
831 can be fit into 87 0 times, resulting in a remainder of 87.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 87 leaves us with 87.
Grab the next digit (7) from the dividend, add it to 87, then carry on: 877 / 831

Let's proceed to step 3:
877 divided by 831 is 1 with a remainder of 46.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 46 after subtracting 831 from 877.
Take the next digit (3) from the dividend and append it to 46, then repeat: 463 / 831

Step 4:
463 divided by 831 is 0 with a remainder of 463.
The next digit of our result is 0. 
Result so far: 10.0
Deduct 0 from 463 and we're left with 463.
Fetch the next digit (1) from the dividend, attach it to 463 and continue: 4631 / 831

On to step 5:
When dividing 4631 by 831, we get 5 with a remainder of 476.
Record the quotient 5 as the next digit in the result. 
Result so far: 105.0
Subtract 4155 from 4631 to get 476.
Append the next digit (9) from the dividend to 476 and continue with: 4769 / 831

Step 6:
4769 divided by 831 is 5 with a remainder of 614.
The number 5 becomes the next digit in our result. 
Result so far: 1055.0
Deduct 4155 from 4769 and we're left with 614.
Bring next digit (7) of the dividend behind the 614 and repeat the process: 6147 / 831

Advancing to step 7:
The number 831 fits into 6147 7 times, leaving a remainder of 330.
The next digit of our result is 7. 
Result so far: 10557.0
The remainder is 330 after subtracting 5817 from 6147.
Bring next digit (3) of the dividend behind the 330 and repeat the process: 3303 / 831

On to step 8:
The number 831 fits into 3303 3 times, leaving a remainder of 810.
Record the quotient 3 as the next digit in the result. 
Result so far: 105573.0
Subtracting 2493 from 3303 leaves us with 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Step 9:
8100 divided by 831 is 9 with a remainder of 621.
Record the quotient 9 as the next digit in the result. 
Result so far: 105573.9
Subtracting 7479 from 8100 leaves us 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.

Going ahead to step 10:
If we divide 6210 by 831, we get 7 and a remainder of 393.
The number 7 becomes the next digit in our result. 
Result so far: 105573.97
Deduct 5817 from 6210 and we're left with 393.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3930, and continue the process.

Going ahead to step 11:
When dividing 3930 by 831, we get 4 with a remainder of 606.
Put 4 as the next digit of the answer. 
Result so far: 105573.974
The remainder is 606 after subtracting 3324 from 3930.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Going ahead to step 12:
When dividing 6060 by 831, we get 7 with a remainder of 243.
Put 7 as the next digit of the answer. 
Result so far: 105573.9747
If we subtract 5817 from 6060, we get 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

On to step 13:
The number 831 fits into 2430 2 times, leaving a remainder of 768.
The next digit of our result is 2. 
Result so far: 105573.97472
If we subtract 1662 from 2430, we get 768.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7680, and continue the process.

Step 14:
If we divide 7680 by 831, we get 9 and a remainder of 201.
The number 9 becomes the next digit in our result. 
Result so far: 105573.974729
Subtract 7479 from 7680 to get 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Step 15:
831 goes into 2010 2 times with a remainder of 348.
Write down 2 as next digit of the result. 
Result so far: 105573.9747292
If we take 1662 away from 2010, we end up with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

Step 16:
831 can be fit into 3480 4 times, resulting in a remainder of 156.
Use 4 as the next digit of our solution. 
Result so far: 105573.97472924
Deduct 3324 from 3480 and we're left with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

The final outcome is 105573.97472924, with a leftover of 1.56e-07.