52139 divided by 87 
The aim is to understand the frequency of 87 in 52139.

Step 1:
The number 87 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (2) from the dividend after 5, then repeat: 52 / 87

Let's proceed to step 2:
52 divided by 87 is 0 with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Include the next digit (1) from the dividend after 52, then repeat: 521 / 87

Step 3:
The number 87 fits into 521 5 times, leaving a remainder of 86.
Write down 5 as next digit of the result. 
Result so far: 5.0
The remainder is 86 after subtracting 435 from 521.
Include the next digit (3) from the dividend after 86, then repeat: 863 / 87

Going ahead to step 4:
87 goes into 863 9 times with a remainder of 80.
Record the quotient 9 as the next digit in the result. 
Result so far: 59.0
Subtracting 783 from 863 leaves us with 80.
Include the next digit (9) from the dividend after 80, then repeat: 809 / 87

Going ahead to step 5:
87 goes into 809 9 times with a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 599.0
The remainder is 26 after subtracting 783 from 809.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 6:
The number 87 fits into 260 2 times, leaving a remainder of 86.
Write down 2 as next digit of the result. 
Result so far: 599.2
If we subtract 174 from 260, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 7:
When dividing 860 by 87, we get 9 with a remainder of 77.
Use 9 as the next digit of our solution. 
Result so far: 599.29
Deduct 783 from 860 and we're left with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Going ahead to step 8:
The number 87 fits into 770 8 times, leaving a remainder of 74.
The number 8 becomes the next digit in our result. 
Result so far: 599.298
If we subtract 696 from 770, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 9:
If we divide 740 by 87, we get 8 and a remainder of 44.
Record the quotient 8 as the next digit in the result. 
Result so far: 599.2988
Subtract 696 from 740 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final result is 599.2988 with a remainder of 0.00044.