421686 ÷ 68 
The aim is to understand the frequency of 68 in 421686.

Advancing to step 1:
If we divide 4 by 68, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 68

Moving on to step 2:
42 divided by 68 is 0 with a remainder of 42.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 42 leaves us with 42.
Include the next digit (1) from the dividend after 42, then repeat: 421 / 68

Going ahead to step 3:
If we divide 421 by 68, we get 6 and a remainder of 13.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Deduct 408 from 421 and we're left with 13.
Grab the next digit (6) from the dividend, add it to 13, then carry on: 136 / 68

Let's proceed to step 4:
68 can be fit into 136 2 times, resulting in a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 62.0
The remainder is 0 after subtracting 136 from 136.
Take the next digit (8) from the dividend and append it to 0, then repeat: 8 / 68

Going ahead to step 5:
8 divided by 68 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 620.0
Subtract 0 from 8 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 68

On to step 6:
The number 68 fits into 86 1 times, leaving a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 6201.0
If we subtract 68 from 86, 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.

On to step 7:
The number 68 fits into 180 2 times, leaving a remainder of 44.
Use 2 as the next digit of our solution. 
Result so far: 6201.2
The remainder is 44 after subtracting 136 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 8:
If we divide 440 by 68, we get 6 and a remainder of 32.
The number 6 becomes the next digit in our result. 
Result so far: 6201.26
If we subtract 408 from 440, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 9:
68 can be fit into 320 4 times, resulting in a remainder of 48.
Put 4 as the next digit of the answer. 
Result so far: 6201.264
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.

Going ahead to step 10:
The number 68 fits into 480 7 times, leaving a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 6201.2647
If we take 476 away from 480, we end up 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.

On to step 11:
The number 68 fits into 40 0 times, leaving a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 6201.2647
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
68 can be fit into 400 5 times, resulting in a remainder of 60.
Put 5 as the next digit of the answer. 
Result so far: 6201.264705
Subtracting 340 from 400 leaves us 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.

Let's proceed to step 13:
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: 6201.2647058
The remainder is 56 after subtracting 544 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 14:
560 divided by 68 is 8 with a remainder of 16.
The next digit of our result is 8. 
Result so far: 6201.26470588
Subtract 544 from 560 to 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.

Our division results in 6201.26470588 with a remaining 1.6e-08.