We look at the division of 209517 by 87 
The aim is to understand the frequency of 87 in 209517.

Let's proceed to step 1:
If we divide 2 by 87, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 87

Let's proceed to step 2:
87 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 20, we get 20.
Take the next digit (9) from the dividend and append it to 20, then repeat: 209 / 87

On to step 3:
87 can be fit into 209 2 times, resulting in a remainder of 35.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 174 from 209 to get 35.
Fetch the next digit (5) from the dividend, attach it to 35 and continue: 355 / 87

Step 4:
87 goes into 355 4 times with a remainder of 7.
Record the quotient 4 as the next digit in the result. 
Result so far: 24.0
If we take 348 away from 355, we end up with 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 87

Going ahead to step 5:
87 can be fit into 71 0 times, resulting in a remainder of 71.
Put 0 as the next digit of the answer. 
Result so far: 240.0
If we take 0 away from 71, we end up with 71.
Append the next digit (7) from the dividend to 71 and continue with: 717 / 87

Advancing to step 6:
87 goes into 717 8 times with a remainder of 21.
The number 8 becomes the next digit in our result. 
Result so far: 2408.0
Subtracting 696 from 717 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 7:
210 divided by 87 is 2 with a remainder of 36.
Put 2 as the next digit of the answer. 
Result so far: 2408.2
If we take 174 away from 210, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 8:
If we divide 360 by 87, we get 4 and a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 2408.24
If we subtract 348 from 360, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 9:
When dividing 120 by 87, we get 1 with a remainder of 33.
The number 1 becomes the next digit in our result. 
Result so far: 2408.241
Subtract 87 from 120 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Step 10:
330 divided by 87 is 3 with a remainder of 69.
The next digit of our result is 3. 
Result so far: 2408.2413
If we take 261 away from 330, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 11:
690 divided by 87 is 7 with a remainder of 81.
Write down 7 as next digit of the result. 
Result so far: 2408.24137
Subtract 609 from 690 to get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Going ahead to step 12:
The number 87 fits into 810 9 times, leaving a remainder of 27.
Record the quotient 9 as the next digit in the result. 
Result so far: 2408.241379
Subtracting 783 from 810 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 13:
When dividing 270 by 87, we get 3 with a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 2408.2413793
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.

Step 14:
If we divide 90 by 87, we get 1 and a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 2408.24137931
The remainder is 3 after subtracting 87 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The quotient of the division is 2408.24137931, and the remainder is 3e-09.