We look at the division of 221703 by 87 
The aim is to understand the frequency of 87 in 221703.

Let's proceed to step 1:
2 divided by 87 is 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 87

Moving on to step 2:
22 divided by 87 is 0 with a remainder of 22.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 22, we get 22.
Append the next digit (1) from the dividend to 22 and continue with: 221 / 87

Step 3:
If we divide 221 by 87, we get 2 and a remainder of 47.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 174 from 221 to get 47.
Grab the next digit (7) from the dividend, add it to 47, then carry on: 477 / 87

On to step 4:
477 divided by 87 is 5 with a remainder of 42.
The next digit of our result is 5. 
Result so far: 25.0
The remainder is 42 after subtracting 435 from 477.
Grab the next digit (0) from the dividend, add it to 42, then carry on: 420 / 87

On to step 5:
420 divided by 87 is 4 with a remainder of 72.
Use 4 as the next digit of our solution. 
Result so far: 254.0
The remainder is 72 after subtracting 348 from 420.
Append the next digit (3) from the dividend to 72 and continue with: 723 / 87

Let's proceed to step 6:
87 goes into 723 8 times with a remainder of 27.
Write down 8 as next digit of the result. 
Result so far: 2548.0
If we take 696 away from 723, we end up 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 7:
If we divide 270 by 87, we get 3 and a remainder of 9.
The number 3 becomes the next digit in our result. 
Result so far: 2548.3
If we take 261 away from 270, we end up 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 8:
The number 87 fits into 90 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 2548.31
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.

Let's proceed to step 9:
87 goes into 30 0 times with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 2548.31
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 10:
87 goes into 300 3 times with a remainder of 39.
Use 3 as the next digit of our solution. 
Result so far: 2548.3103
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.

Moving on to step 11:
87 goes into 390 4 times with a remainder of 42.
Use 4 as the next digit of our solution. 
Result so far: 2548.31034
The remainder is 42 after subtracting 348 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 12:
If we divide 420 by 87, we get 4 and a remainder of 72.
Use 4 as the next digit of our solution. 
Result so far: 2548.310344
If we subtract 348 from 420, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

The final outcome is 2548.310344, with a leftover of 7.2e-06.