Let's divide 668556 by 87
The aim is to understand the frequency of 87 in 668556.

Step 1:
If we divide 6 by 87, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 87

Advancing to step 2:
66 divided by 87 is 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Include the next digit (8) from the dividend after 66, then repeat: 668 / 87

Going ahead to step 3:
The number 87 fits into 668 7 times, leaving a remainder of 59.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Deduct 609 from 668 and we're left with 59.
Grab the next digit (5) from the dividend, add it to 59, then carry on: 595 / 87

On to step 4:
If we divide 595 by 87, we get 6 and a remainder of 73.
Use 6 as the next digit of our solution. 
Result so far: 76.0
Subtract 522 from 595 to get 73.
Include the next digit (5) from the dividend after 73, then repeat: 735 / 87

Going ahead to step 5:
87 can be fit into 735 8 times, resulting in a remainder of 39.
Put 8 as the next digit of the answer. 
Result so far: 768.0
Subtract 696 from 735 to get 39.
Grab the next digit (6) from the dividend, add it to 39, then carry on: 396 / 87

Moving on to step 6:
87 can be fit into 396 4 times, resulting in a remainder of 48.
Put 4 as the next digit of the answer. 
Result so far: 7684.0
If we take 348 away from 396, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 7:
The number 87 fits into 480 5 times, leaving a remainder of 45.
Record the quotient 5 as the next digit in the result. 
Result so far: 7684.5
The remainder is 45 after subtracting 435 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 8:
If we divide 450 by 87, we get 5 and a remainder of 15.
The next digit of our result is 5. 
Result so far: 7684.55
The remainder is 15 after subtracting 435 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 7684.55 with a remainder of 0.015.