We're dividing 209181 by 87 
The aim is to understand the frequency of 87 in 209181.

Going ahead to step 1:
87 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 87

Advancing to step 2:
87 can be fit into 20 0 times, resulting in a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 20 and we're left with 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 87

Going ahead to step 3:
87 can be fit into 209 2 times, resulting in a remainder of 35.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 174 from 209 and we're left with 35.
Fetch the next digit (1) from the dividend, attach it to 35 and continue: 351 / 87

Let's proceed to step 4:
The number 87 fits into 351 4 times, leaving a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 24.0
Deduct 348 from 351 and we're left with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 87

On to step 5:
38 divided by 87 is 0 with a remainder of 38.
Write down 0 as next digit of the result. 
Result so far: 240.0
If we subtract 0 from 38, we get 38.
Bring next digit (1) of the dividend behind the 38 and repeat the process: 381 / 87

Step 6:
381 divided by 87 is 4 with a remainder of 33.
Put 4 as the next digit of the answer. 
Result so far: 2404.0
Subtracting 348 from 381 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

On to step 7:
87 can be fit into 330 3 times, resulting in a remainder of 69.
Use 3 as the next digit of our solution. 
Result so far: 2404.3
The remainder is 69 after subtracting 261 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 8:
The number 87 fits into 690 7 times, leaving a remainder of 81.
Use 7 as the next digit of our solution. 
Result so far: 2404.37
The remainder is 81 after subtracting 609 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 9:
If we divide 810 by 87, we get 9 and a remainder of 27.
The next digit of our result is 9. 
Result so far: 2404.379
Subtract 783 from 810 to get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 10:
The number 87 fits into 270 3 times, leaving a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 2404.3793
Subtracting 261 from 270 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
90 divided by 87 is 1 with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 2404.37931
If we subtract 87 from 90, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 12:
The number 87 fits into 30 0 times, leaving a remainder of 30.
The next digit of our result is 0. 
Result so far: 2404.37931
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 13:
When dividing 300 by 87, we get 3 with a remainder of 39.
Use 3 as the next digit of our solution. 
Result so far: 2404.3793103
Subtracting 261 from 300 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 14:
87 goes into 390 4 times with a remainder of 42.
Record the quotient 4 as the next digit in the result. 
Result so far: 2404.37931034
Subtract 348 from 390 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

After the division, we end up with 2404.37931034 and a remainder of 4.2e-08.