661231 ÷ 68 
The aim is to understand the frequency of 68 in 661231.

Going ahead to step 1:
6 divided by 68 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 68

Let's proceed to step 2:
68 goes into 66 0 times with a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Append the next digit (1) from the dividend to 66 and continue with: 661 / 68

On to step 3:
661 divided by 68 is 9 with a remainder of 49.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we subtract 612 from 661, we get 49.
Take the next digit (2) from the dividend and append it to 49, then repeat: 492 / 68

Going ahead to step 4:
68 goes into 492 7 times with a remainder of 16.
Record the quotient 7 as the next digit in the result. 
Result so far: 97.0
Deduct 476 from 492 and we're left with 16.
Take the next digit (3) from the dividend and append it to 16, then repeat: 163 / 68

On to step 5:
68 can be fit into 163 2 times, resulting in a remainder of 27.
Write down 2 as next digit of the result. 
Result so far: 972.0
Deduct 136 from 163 and we're left with 27.
Include the next digit (1) from the dividend after 27, then repeat: 271 / 68

Let's proceed to step 6:
271 divided by 68 is 3 with a remainder of 67.
Write down 3 as next digit of the result. 
Result so far: 9723.0
Subtract 204 from 271 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Going ahead to step 7:
68 can be fit into 670 9 times, resulting in a remainder of 58.
The number 9 becomes the next digit in our result. 
Result so far: 9723.9
Deduct 612 from 670 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 8:
580 divided by 68 is 8 with a remainder of 36.
Write down 8 as next digit of the result. 
Result so far: 9723.98
If we subtract 544 from 580, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 9:
68 can be fit into 360 5 times, resulting in a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 9723.985
If we subtract 340 from 360, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 10:
68 goes into 200 2 times with a remainder of 64.
Record the quotient 2 as the next digit in the result. 
Result so far: 9723.9852
Deduct 136 from 200 and we're left with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 11:
68 can be fit into 640 9 times, resulting in a remainder of 28.
The number 9 becomes the next digit in our result. 
Result so far: 9723.98529
Subtract 612 from 640 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 12:
68 can be fit into 280 4 times, resulting in a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 9723.985294
The remainder is 8 after subtracting 272 from 280.
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:
68 goes into 80 1 times with a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 9723.9852941
Subtracting 68 from 80 leaves us 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.

On to step 14:
68 can be fit into 120 1 times, resulting in a remainder of 52.
Write down 1 as next digit of the result. 
Result so far: 9723.98529411
If we take 68 away from 120, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

After the division, we end up with 9723.98529411 and a remainder of 5.2e-08.