We look at the division of 9851240 by 815 
The aim is to understand the frequency of 815 in 9851240.

Moving on to step 1:
The number 815 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 815

Going ahead to step 2:
The number 815 fits into 98 0 times, leaving a remainder of 98.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 98 after subtracting 0 from 98.
Append the next digit (5) from the dividend to 98 and continue with: 985 / 815

Let's proceed to step 3:
815 can be fit into 985 1 times, resulting in a remainder of 170.
The next digit of our result is 1. 
Result so far: 1.0
If we take 815 away from 985, we end up with 170.
Grab the next digit (1) from the dividend, add it to 170, then carry on: 1701 / 815

Let's proceed to step 4:
1701 divided by 815 is 2 with a remainder of 71.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 1630 from 1701 to get 71.
Bring next digit (2) of the dividend behind the 71 and repeat the process: 712 / 815

Step 5:
If we divide 712 by 815, we get 0 and a remainder of 712.
Write down 0 as next digit of the result. 
Result so far: 120.0
If we take 0 away from 712, we end up with 712.
Append the next digit (4) from the dividend to 712 and continue with: 7124 / 815

Let's proceed to step 6:
7124 divided by 815 is 8 with a remainder of 604.
Put 8 as the next digit of the answer. 
Result so far: 1208.0
Subtract 6520 from 7124 to get 604.
Take the next digit (0) from the dividend and append it to 604, then repeat: 6040 / 815

Let's proceed to step 7:
815 goes into 6040 7 times with a remainder of 335.
Use 7 as the next digit of our solution. 
Result so far: 12087.0
If we take 5705 away from 6040, we end up with 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Step 8:
3350 divided by 815 is 4 with a remainder of 90.
Record the quotient 4 as the next digit in the result. 
Result so far: 12087.4
If we take 3260 away from 3350, we end up with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Advancing to step 9:
815 goes into 900 1 times with a remainder of 85.
The next digit of our result is 1. 
Result so far: 12087.41
If we subtract 815 from 900, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Moving on to step 10:
When dividing 850 by 815, we get 1 with a remainder of 35.
Record the quotient 1 as the next digit in the result. 
Result so far: 12087.411
Subtract 815 from 850 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Our division results in 12087.411 with a remaining 0.0035.