We look at the division of 801881 by 87 
The aim is to understand the frequency of 87 in 801881.

Let's proceed to step 1:
If we divide 8 by 87, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Include the next digit (0) from the dividend after 8, then repeat: 80 / 87

Going ahead to step 2:
80 divided by 87 is 0 with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 80 to get 80.
Grab the next digit (1) from the dividend, add it to 80, then carry on: 801 / 87

On to step 3:
87 goes into 801 9 times with a remainder of 18.
The next digit of our result is 9. 
Result so far: 9.0
The remainder is 18 after subtracting 783 from 801.
Take the next digit (8) from the dividend and append it to 18, then repeat: 188 / 87

Advancing to step 4:
87 goes into 188 2 times with a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 92.0
The remainder is 14 after subtracting 174 from 188.
Include the next digit (8) from the dividend after 14, then repeat: 148 / 87

Moving on to step 5:
87 can be fit into 148 1 times, resulting in a remainder of 61.
Write down 1 as next digit of the result. 
Result so far: 921.0
Subtract 87 from 148 to get 61.
Include the next digit (1) from the dividend after 61, then repeat: 611 / 87

Step 6:
When dividing 611 by 87, we get 7 with a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 9217.0
The remainder is 2 after subtracting 609 from 611.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 7:
20 divided by 87 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 9217.0
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
200 divided by 87 is 2 with a remainder of 26.
Record the quotient 2 as the next digit in the result. 
Result so far: 9217.02
Subtract 174 from 200 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 9:
260 divided by 87 is 2 with a remainder of 86.
The next digit of our result is 2. 
Result so far: 9217.022
Subtracting 174 from 260 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

After the division, we end up with 9217.022 and a remainder of 0.0086.