We look at the division of 673520 by 68 
The aim is to understand the frequency of 68 in 673520.

Let's proceed to step 1:
68 goes into 6 0 times with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (7) from the dividend, add it to 6, then carry on: 67 / 68

On to step 2:
When dividing 67 by 68, we get 0 with a remainder of 67.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 67, we end up with 67.
Append the next digit (3) from the dividend to 67 and continue with: 673 / 68

Moving on to step 3:
68 goes into 673 9 times with a remainder of 61.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtract 612 from 673 to get 61.
Append the next digit (5) from the dividend to 61 and continue with: 615 / 68

Step 4:
68 goes into 615 9 times with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 99.0
Subtract 612 from 615 to get 3.
Append the next digit (2) from the dividend to 3 and continue with: 32 / 68

Moving on to step 5:
The number 68 fits into 32 0 times, leaving a remainder of 32.
Write down 0 as next digit of the result. 
Result so far: 990.0
Subtracting 0 from 32 leaves us with 32.
Take the next digit (0) from the dividend and append it to 32, then repeat: 320 / 68

Going ahead to step 6:
If we divide 320 by 68, we get 4 and a remainder of 48.
Use 4 as the next digit of our solution. 
Result so far: 9904.0
If we take 272 away from 320, we end up 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.

Let's proceed to step 7:
The number 68 fits into 480 7 times, leaving a remainder of 4.
The next digit of our result is 7. 
Result so far: 9904.7
Deduct 476 from 480 and we're left 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.

Step 8:
40 divided by 68 is 0 with a remainder of 40.
The next digit of our result is 0. 
Result so far: 9904.7
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 9:
400 divided by 68 is 5 with a remainder of 60.
The number 5 becomes the next digit in our result. 
Result so far: 9904.705
If we take 340 away from 400, we end up 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 10:
68 can be fit into 600 8 times, resulting in a remainder of 56.
Record the quotient 8 as the next digit in the result. 
Result so far: 9904.7058
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.

On to step 11:
The number 68 fits into 560 8 times, leaving a remainder of 16.
The number 8 becomes the next digit in our result. 
Result so far: 9904.70588
The remainder is 16 after subtracting 544 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 9904.70588 with a remaining 1.6e-05.