We look at the division of 669523 by 68 
The aim is to understand the frequency of 68 in 669523.

On to step 1:
If we divide 6 by 68, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 68

Let's proceed to step 2:
66 divided by 68 is 0 with a remainder of 66.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Append the next digit (9) from the dividend to 66 and continue with: 669 / 68

On to step 3:
669 divided by 68 is 9 with a remainder of 57.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 612 from 669 to get 57.
Append the next digit (5) from the dividend to 57 and continue with: 575 / 68

On to step 4:
The number 68 fits into 575 8 times, leaving a remainder of 31.
The next digit of our result is 8. 
Result so far: 98.0
The remainder is 31 after subtracting 544 from 575.
Take the next digit (2) from the dividend and append it to 31, then repeat: 312 / 68

Step 5:
68 can be fit into 312 4 times, resulting in a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 984.0
Subtract 272 from 312 to get 40.
Include the next digit (3) from the dividend after 40, then repeat: 403 / 68

Let's proceed to step 6:
The number 68 fits into 403 5 times, leaving a remainder of 63.
The next digit of our result is 5. 
Result so far: 9845.0
If we take 340 away from 403, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Going ahead to step 7:
The number 68 fits into 630 9 times, leaving a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 9845.9
If we subtract 612 from 630, we 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:
68 goes into 180 2 times with a remainder of 44.
The next digit of our result is 2. 
Result so far: 9845.92
If we take 136 away from 180, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 9:
440 divided by 68 is 6 with a remainder of 32.
The next digit of our result is 6. 
Result so far: 9845.926
The remainder is 32 after subtracting 408 from 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 10:
If we divide 320 by 68, we get 4 and a remainder of 48.
Record the quotient 4 as the next digit in the result. 
Result so far: 9845.9264
Deduct 272 from 320 and we're left with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 11:
The number 68 fits into 480 7 times, leaving a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 9845.92647
Subtracting 476 from 480 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 12:
If we divide 40 by 68, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 9845.92647
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 13:
If we divide 400 by 68, we get 5 and a remainder of 60.
The next digit of our result is 5. 
Result so far: 9845.9264705
Deduct 340 from 400 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 14:
68 goes into 600 8 times with a remainder of 56.
Put 8 as the next digit of the answer. 
Result so far: 9845.92647058
If we take 544 away from 600, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

After the division, we end up with 9845.92647058 and a remainder of 5.6e-08.