We divide 639564 by 88
The aim is to understand the frequency of 88 in 639564.

On to step 1:
6 divided by 88 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 88

Let's proceed to step 2:
If we divide 63 by 88, we get 0 and a remainder of 63.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 63 to get 63.
Include the next digit (9) from the dividend after 63, then repeat: 639 / 88

Going ahead to step 3:
The number 88 fits into 639 7 times, leaving a remainder of 23.
The next digit of our result is 7. 
Result so far: 7.0
Deduct 616 from 639 and we're left with 23.
Append the next digit (5) from the dividend to 23 and continue with: 235 / 88

Let's proceed to step 4:
88 can be fit into 235 2 times, resulting in a remainder of 59.
Use 2 as the next digit of our solution. 
Result so far: 72.0
If we take 176 away from 235, we end up with 59.
Include the next digit (6) from the dividend after 59, then repeat: 596 / 88

Moving on to step 5:
88 goes into 596 6 times with a remainder of 68.
Record the quotient 6 as the next digit in the result. 
Result so far: 726.0
If we subtract 528 from 596, we get 68.
Take the next digit (4) from the dividend and append it to 68, then repeat: 684 / 88

Moving on to step 6:
If we divide 684 by 88, we get 7 and a remainder of 68.
The next digit of our result is 7. 
Result so far: 7267.0
The remainder is 68 after subtracting 616 from 684.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Moving on to step 7:
88 goes into 680 7 times with a remainder of 64.
The next digit of our result is 7. 
Result so far: 7267.7
If we take 616 away from 680, 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.

Step 8:
88 goes into 640 7 times with a remainder of 24.
Record the quotient 7 as the next digit in the result. 
Result so far: 7267.77
If we subtract 616 from 640, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final outcome is 7267.77, with a leftover of 0.024.