90813745 divided by 836 
The aim is to understand the frequency of 836 in 90813745.

Step 1:
When dividing 9 by 836, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 836

Going ahead to step 2:
836 goes into 90 0 times with a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Grab the next digit (8) from the dividend, add it to 90, then carry on: 908 / 836

Let's proceed to step 3:
836 goes into 908 1 times with a remainder of 72.
The next digit of our result is 1. 
Result so far: 1.0
If we take 836 away from 908, we end up with 72.
Grab the next digit (1) from the dividend, add it to 72, then carry on: 721 / 836

Step 4:
If we divide 721 by 836, we get 0 and a remainder of 721.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
If we take 0 away from 721, we end up with 721.
Bring next digit (3) of the dividend behind the 721 and repeat the process: 7213 / 836

Going ahead to step 5:
When dividing 7213 by 836, we get 8 with a remainder of 525.
Record the quotient 8 as the next digit in the result. 
Result so far: 108.0
Deduct 6688 from 7213 and we're left with 525.
Include the next digit (7) from the dividend after 525, then repeat: 5257 / 836

On to step 6:
5257 divided by 836 is 6 with a remainder of 241.
The next digit of our result is 6. 
Result so far: 1086.0
Subtract 5016 from 5257 to get 241.
Grab the next digit (4) from the dividend, add it to 241, then carry on: 2414 / 836

Let's proceed to step 7:
836 can be fit into 2414 2 times, resulting in a remainder of 742.
Write down 2 as next digit of the result. 
Result so far: 10862.0
If we subtract 1672 from 2414, we get 742.
Append the next digit (5) from the dividend to 742 and continue with: 7425 / 836

Let's proceed to step 8:
7425 divided by 836 is 8 with a remainder of 737.
Record the quotient 8 as the next digit in the result. 
Result so far: 108628.0
Subtract 6688 from 7425 to get 737.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7370, and continue the process.

Going ahead to step 9:
When dividing 7370 by 836, we get 8 with a remainder of 682.
Record the quotient 8 as the next digit in the result. 
Result so far: 108628.8
Subtracting 6688 from 7370 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.

Moving on to step 10:
836 can be fit into 6820 8 times, resulting in a remainder of 132.
The number 8 becomes the next digit in our result. 
Result so far: 108628.88
The remainder is 132 after subtracting 6688 from 6820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

The final outcome is 108628.88, with a leftover of 0.132.