643945 ÷ 88 
The aim is to understand the frequency of 88 in 643945.

Let's proceed to step 1:
When dividing 6 by 88, we get 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 88

Moving on to step 2:
88 goes into 64 0 times with a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Take the next digit (3) from the dividend and append it to 64, then repeat: 643 / 88

Step 3:
88 goes into 643 7 times with a remainder of 27.
Put 7 as the next digit of the answer. 
Result so far: 7.0
The remainder is 27 after subtracting 616 from 643.
Take the next digit (9) from the dividend and append it to 27, then repeat: 279 / 88

Going ahead to step 4:
When dividing 279 by 88, we get 3 with a remainder of 15.
The next digit of our result is 3. 
Result so far: 73.0
If we take 264 away from 279, we end up with 15.
Bring next digit (4) of the dividend behind the 15 and repeat the process: 154 / 88

Moving on to step 5:
88 goes into 154 1 times with a remainder of 66.
Record the quotient 1 as the next digit in the result. 
Result so far: 731.0
The remainder is 66 after subtracting 88 from 154.
Grab the next digit (5) from the dividend, add it to 66, then carry on: 665 / 88

Going ahead to step 6:
If we divide 665 by 88, we get 7 and a remainder of 49.
Write down 7 as next digit of the result. 
Result so far: 7317.0
If we take 616 away from 665, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 7:
490 divided by 88 is 5 with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 7317.5
Subtract 440 from 490 to get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 8:
When dividing 500 by 88, we get 5 with a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 7317.55
If we subtract 440 from 500, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Our division results in 7317.55 with a remaining 0.06.