666619 ÷ 88 
The aim is to understand the frequency of 88 in 666619.

Step 1:
If we divide 6 by 88, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 88

Going ahead to step 2:
The number 88 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Fetch the next digit (6) from the dividend, attach it to 66 and continue: 666 / 88

Step 3:
The number 88 fits into 666 7 times, leaving a remainder of 50.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 50 after subtracting 616 from 666.
Bring next digit (6) of the dividend behind the 50 and repeat the process: 506 / 88

Step 4:
88 can be fit into 506 5 times, resulting in a remainder of 66.
Record the quotient 5 as the next digit in the result. 
Result so far: 75.0
If we take 440 away from 506, we end up with 66.
Bring next digit (1) of the dividend behind the 66 and repeat the process: 661 / 88

Step 5:
When dividing 661 by 88, we get 7 with a remainder of 45.
The number 7 becomes the next digit in our result. 
Result so far: 757.0
Deduct 616 from 661 and we're left with 45.
Bring next digit (9) of the dividend behind the 45 and repeat the process: 459 / 88

Moving on to step 6:
If we divide 459 by 88, we get 5 and a remainder of 19.
Put 5 as the next digit of the answer. 
Result so far: 7575.0
Subtract 440 from 459 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
The number 88 fits into 190 2 times, leaving a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 7575.2
Subtracting 176 from 190 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
If we divide 140 by 88, we get 1 and a remainder of 52.
Use 1 as the next digit of our solution. 
Result so far: 7575.21
The remainder is 52 after subtracting 88 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 9:
If we divide 520 by 88, we get 5 and a remainder of 80.
Put 5 as the next digit of the answer. 
Result so far: 7575.215
Subtract 440 from 520 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 10:
88 goes into 800 9 times with a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 7575.2159
Subtracting 792 from 800 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 11:
88 goes into 80 0 times with a remainder of 80.
The next digit of our result is 0. 
Result so far: 7575.2159
Subtract 0 from 80 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 12:
88 goes into 800 9 times with a remainder of 8.
The next digit of our result is 9. 
Result so far: 7575.215909
The remainder is 8 after subtracting 792 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 13:
88 can be fit into 80 0 times, resulting in a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 7575.215909
Subtract 0 from 80 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 14:
88 goes into 800 9 times with a remainder of 8.
Put 9 as the next digit of the answer. 
Result so far: 7575.21590909
The remainder is 8 after subtracting 792 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 7575.21590909 with a remainder of 8e-09.