51399748 divided by 831 
The aim is to understand the frequency of 831 in 51399748.

Step 1:
The number 831 fits into 5 0 times, leaving a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 831

On to step 2:
If we divide 51 by 831, we get 0 and a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Grab the next digit (3) from the dividend, add it to 51, then carry on: 513 / 831

Going ahead to step 3:
If we divide 513 by 831, we get 0 and a remainder of 513.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 513 to get 513.
Grab the next digit (9) from the dividend, add it to 513, then carry on: 5139 / 831

Advancing to step 4:
831 goes into 5139 6 times with a remainder of 153.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 4986 from 5139 leaves us with 153.
Append the next digit (9) from the dividend to 153 and continue with: 1539 / 831

Moving on to step 5:
831 can be fit into 1539 1 times, resulting in a remainder of 708.
Write down 1 as next digit of the result. 
Result so far: 61.0
If we take 831 away from 1539, we end up with 708.
Bring next digit (7) of the dividend behind the 708 and repeat the process: 7087 / 831

Advancing to step 6:
831 goes into 7087 8 times with a remainder of 439.
Use 8 as the next digit of our solution. 
Result so far: 618.0
Subtract 6648 from 7087 to get 439.
Append the next digit (4) from the dividend to 439 and continue with: 4394 / 831

Going ahead to step 7:
831 can be fit into 4394 5 times, resulting in a remainder of 239.
Record the quotient 5 as the next digit in the result. 
Result so far: 6185.0
Subtract 4155 from 4394 to get 239.
Take the next digit (8) from the dividend and append it to 239, then repeat: 2398 / 831

On to step 8:
831 goes into 2398 2 times with a remainder of 736.
Record the quotient 2 as the next digit in the result. 
Result so far: 61852.0
If we subtract 1662 from 2398, we get 736.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7360, and continue the process.

Step 9:
The number 831 fits into 7360 8 times, leaving a remainder of 712.
Put 8 as the next digit of the answer. 
Result so far: 61852.8
Subtracting 6648 from 7360 leaves us with 712.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7120, and continue the process.

On to step 10:
The number 831 fits into 7120 8 times, leaving a remainder of 472.
Put 8 as the next digit of the answer. 
Result so far: 61852.88
Subtracting 6648 from 7120 leaves us with 472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4720, and continue the process.

The final result is 61852.88 with a remainder of 0.472.