We look at the division of 623629 by 87 
The aim is to understand the frequency of 87 in 623629.

Step 1:
87 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 87

Step 2:
62 divided by 87 is 0 with a remainder of 62.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 62 after subtracting 0 from 62.
Append the next digit (3) from the dividend to 62 and continue with: 623 / 87

Advancing to step 3:
When dividing 623 by 87, we get 7 with a remainder of 14.
Write down 7 as next digit of the result. 
Result so far: 7.0
Deduct 609 from 623 and we're left with 14.
Include the next digit (6) from the dividend after 14, then repeat: 146 / 87

Step 4:
146 divided by 87 is 1 with a remainder of 59.
Use 1 as the next digit of our solution. 
Result so far: 71.0
The remainder is 59 after subtracting 87 from 146.
Append the next digit (2) from the dividend to 59 and continue with: 592 / 87

Advancing to step 5:
87 can be fit into 592 6 times, resulting in a remainder of 70.
The number 6 becomes the next digit in our result. 
Result so far: 716.0
The remainder is 70 after subtracting 522 from 592.
Take the next digit (9) from the dividend and append it to 70, then repeat: 709 / 87

On to step 6:
If we divide 709 by 87, we get 8 and a remainder of 13.
Put 8 as the next digit of the answer. 
Result so far: 7168.0
If we subtract 696 from 709, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 7:
87 goes into 130 1 times with a remainder of 43.
Use 1 as the next digit of our solution. 
Result so far: 7168.1
Subtract 87 from 130 to get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 8:
The number 87 fits into 430 4 times, leaving a remainder of 82.
The next digit of our result is 4. 
Result so far: 7168.14
If we take 348 away from 430, we end up with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 9:
87 can be fit into 820 9 times, resulting in a remainder of 37.
The next digit of our result is 9. 
Result so far: 7168.149
If we take 783 away from 820, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 10:
87 can be fit into 370 4 times, resulting in a remainder of 22.
Write down 4 as next digit of the result. 
Result so far: 7168.1494
Subtract 348 from 370 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 11:
87 can be fit into 220 2 times, resulting in a remainder of 46.
The number 2 becomes the next digit in our result. 
Result so far: 7168.14942
Deduct 174 from 220 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 12:
The number 87 fits into 460 5 times, leaving a remainder of 25.
Put 5 as the next digit of the answer. 
Result so far: 7168.149425
The remainder is 25 after subtracting 435 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 13:
When dividing 250 by 87, we get 2 with a remainder of 76.
Use 2 as the next digit of our solution. 
Result so far: 7168.1494252
If we take 174 away from 250, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Let's proceed to step 14:
87 can be fit into 760 8 times, resulting in a remainder of 64.
Put 8 as the next digit of the answer. 
Result so far: 7168.14942528
Subtract 696 from 760 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Our division results in 7168.14942528 with a remaining 6.4e-08.