Let's divide 78576817 by 831
The aim is to understand the frequency of 831 in 78576817.

Advancing to step 1:
When dividing 7 by 831, we get 0 with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 7 and we're left with 7.
Take the next digit (8) from the dividend and append it to 7, then repeat: 78 / 831

Step 2:
If we divide 78 by 831, we get 0 and a remainder of 78.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Append the next digit (5) from the dividend to 78 and continue with: 785 / 831

Moving on to step 3:
When dividing 785 by 831, we get 0 with a remainder of 785.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 785 leaves us with 785.
Bring next digit (7) of the dividend behind the 785 and repeat the process: 7857 / 831

Advancing to step 4:
If we divide 7857 by 831, we get 9 and a remainder of 378.
The next digit of our result is 9. 
Result so far: 9.0
Deduct 7479 from 7857 and we're left with 378.
Append the next digit (6) from the dividend to 378 and continue with: 3786 / 831

On to step 5:
3786 divided by 831 is 4 with a remainder of 462.
Record the quotient 4 as the next digit in the result. 
Result so far: 94.0
The remainder is 462 after subtracting 3324 from 3786.
Include the next digit (8) from the dividend after 462, then repeat: 4628 / 831

On to step 6:
831 goes into 4628 5 times with a remainder of 473.
Use 5 as the next digit of our solution. 
Result so far: 945.0
If we subtract 4155 from 4628, we get 473.
Fetch the next digit (1) from the dividend, attach it to 473 and continue: 4731 / 831

Moving on to step 7:
831 can be fit into 4731 5 times, resulting in a remainder of 576.
Use 5 as the next digit of our solution. 
Result so far: 9455.0
Deduct 4155 from 4731 and we're left with 576.
Grab the next digit (7) from the dividend, add it to 576, then carry on: 5767 / 831

Let's proceed to step 8:
831 can be fit into 5767 6 times, resulting in a remainder of 781.
Use 6 as the next digit of our solution. 
Result so far: 94556.0
If we subtract 4986 from 5767, we get 781.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7810, and continue the process.

On to step 9:
When dividing 7810 by 831, we get 9 with a remainder of 331.
The next digit of our result is 9. 
Result so far: 94556.9
Subtract 7479 from 7810 to get 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Step 10:
831 can be fit into 3310 3 times, resulting in a remainder of 817.
The number 3 becomes the next digit in our result. 
Result so far: 94556.93
If we subtract 2493 from 3310, we get 817.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8170, and continue the process.

Advancing to step 11:
If we divide 8170 by 831, we get 9 and a remainder of 691.
Put 9 as the next digit of the answer. 
Result so far: 94556.939
If we take 7479 away from 8170, we end up with 691.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6910, and continue the process.

Going ahead to step 12:
The number 831 fits into 6910 8 times, leaving a remainder of 262.
The next digit of our result is 8. 
Result so far: 94556.9398
If we take 6648 away from 6910, we end up with 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Moving on to step 13:
831 can be fit into 2620 3 times, resulting in a remainder of 127.
The number 3 becomes the next digit in our result. 
Result so far: 94556.93983
Subtract 2493 from 2620 to get 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Going ahead to step 14:
831 goes into 1270 1 times with a remainder of 439.
The next digit of our result is 1. 
Result so far: 94556.939831
Subtracting 831 from 1270 leaves us with 439.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4390, and continue the process.

Let's proceed to step 15:
831 goes into 4390 5 times with a remainder of 235.
Write down 5 as next digit of the result. 
Result so far: 94556.9398315
Subtract 4155 from 4390 to get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Going ahead to step 16:
2350 divided by 831 is 2 with a remainder of 688.
Put 2 as the next digit of the answer. 
Result so far: 94556.93983152
The remainder is 688 after subtracting 1662 from 2350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6880, and continue the process.

The final result is 94556.93983152 with a remainder of 6.88e-07.