688603 divided by 28 
The aim is to understand the frequency of 28 in 688603.

Step 1:
The number 28 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Take the next digit (8) from the dividend and append it to 6, then repeat: 68 / 28

On to step 2:
68 divided by 28 is 2 with a remainder of 12.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 56 from 68 and we're left with 12.
Take the next digit (8) from the dividend and append it to 12, then repeat: 128 / 28

Advancing to step 3:
If we divide 128 by 28, we get 4 and a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 24.0
If we take 112 away from 128, we end up with 16.
Grab the next digit (6) from the dividend, add it to 16, then carry on: 166 / 28

Step 4:
166 divided by 28 is 5 with a remainder of 26.
The number 5 becomes the next digit in our result. 
Result so far: 245.0
The remainder is 26 after subtracting 140 from 166.
Grab the next digit (0) from the dividend, add it to 26, then carry on: 260 / 28

Advancing to step 5:
When dividing 260 by 28, we get 9 with a remainder of 8.
Use 9 as the next digit of our solution. 
Result so far: 2459.0
The remainder is 8 after subtracting 252 from 260.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 28

On to step 6:
When dividing 83 by 28, we get 2 with a remainder of 27.
The next digit of our result is 2. 
Result so far: 24592.0
The remainder is 27 after subtracting 56 from 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 7:
28 can be fit into 270 9 times, resulting in a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 24592.9
Subtract 252 from 270 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 8:
If we divide 180 by 28, we get 6 and a remainder of 12.
Write down 6 as next digit of the result. 
Result so far: 24592.96
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
If we divide 120 by 28, we get 4 and a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 24592.964
Subtracting 112 from 120 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.

Moving on to step 10:
The number 28 fits into 80 2 times, leaving a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 24592.9642
Subtract 56 from 80 to 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.

On to step 11:
28 can be fit into 240 8 times, resulting in a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 24592.96428
If we subtract 224 from 240, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 12:
28 goes into 160 5 times with a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 24592.964285
The remainder is 20 after subtracting 140 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 13:
200 divided by 28 is 7 with a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 24592.9642857
Subtract 196 from 200 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 14:
If we divide 40 by 28, we get 1 and a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 24592.96428571
If we take 28 away from 40, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 24592.96428571, and the remainder is 1.2e-08.