673858 divided by 87 
The aim is to understand the frequency of 87 in 673858.

On to step 1:
87 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 87

Let's proceed to step 2:
87 goes into 67 0 times with a remainder of 67.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 67, we get 67.
Append the next digit (3) from the dividend to 67 and continue with: 673 / 87

Advancing to step 3:
87 goes into 673 7 times with a remainder of 64.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we subtract 609 from 673, we get 64.
Bring next digit (8) of the dividend behind the 64 and repeat the process: 648 / 87

Step 4:
The number 87 fits into 648 7 times, leaving a remainder of 39.
Put 7 as the next digit of the answer. 
Result so far: 77.0
Deduct 609 from 648 and we're left with 39.
Append the next digit (5) from the dividend to 39 and continue with: 395 / 87

Going ahead to step 5:
The number 87 fits into 395 4 times, leaving a remainder of 47.
Record the quotient 4 as the next digit in the result. 
Result so far: 774.0
The remainder is 47 after subtracting 348 from 395.
Append the next digit (8) from the dividend to 47 and continue with: 478 / 87

On to step 6:
87 goes into 478 5 times with a remainder of 43.
Put 5 as the next digit of the answer. 
Result so far: 7745.0
The remainder is 43 after subtracting 435 from 478.
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 7:
The number 87 fits into 430 4 times, leaving a remainder of 82.
Put 4 as the next digit of the answer. 
Result so far: 7745.4
The remainder is 82 after subtracting 348 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Moving on to step 8:
87 can be fit into 820 9 times, resulting in a remainder of 37.
Put 9 as the next digit of the answer. 
Result so far: 7745.49
The remainder is 37 after subtracting 783 from 820.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Advancing to step 9:
87 can be fit into 370 4 times, resulting in a remainder of 22.
The number 4 becomes the next digit in our result. 
Result so far: 7745.494
If we take 348 away from 370, we end up with 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 10:
When dividing 220 by 87, we get 2 with a remainder of 46.
The number 2 becomes the next digit in our result. 
Result so far: 7745.4942
If we subtract 174 from 220, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 11:
460 divided by 87 is 5 with a remainder of 25.
The next digit of our result is 5. 
Result so far: 7745.49425
If we take 435 away from 460, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Advancing to step 12:
The number 87 fits into 250 2 times, leaving a remainder of 76.
The number 2 becomes the next digit in our result. 
Result so far: 7745.494252
If we subtract 174 from 250, we get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 13:
87 can be fit into 760 8 times, resulting in a remainder of 64.
The next digit of our result is 8. 
Result so far: 7745.4942528
If we take 696 away from 760, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 14:
87 can be fit into 640 7 times, resulting in a remainder of 31.
Put 7 as the next digit of the answer. 
Result so far: 7745.49425287
Deduct 609 from 640 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

After the division, we end up with 7745.49425287 and a remainder of 3.1e-08.