640279 ÷ 12 
The aim is to understand the frequency of 12 in 640279.

On to step 1:
12 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 12

Going ahead to step 2:
When dividing 64 by 12, we get 5 with a remainder of 4.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 60 from 64, we get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 12

Going ahead to step 3:
12 can be fit into 40 3 times, resulting in a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 53.0
If we subtract 36 from 40, we get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 12

Moving on to step 4:
12 can be fit into 42 3 times, resulting in a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 533.0
If we subtract 36 from 42, we get 6.
Fetch the next digit (7) from the dividend, attach it to 6 and continue: 67 / 12

Step 5:
If we divide 67 by 12, we get 5 and a remainder of 7.
Use 5 as the next digit of our solution. 
Result so far: 5335.0
If we take 60 away from 67, we end up with 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 12

Moving on to step 6:
79 divided by 12 is 6 with a remainder of 7.
The next digit of our result is 6. 
Result so far: 53356.0
Deduct 72 from 79 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
The number 12 fits into 70 5 times, leaving a remainder of 10.
The next digit of our result is 5. 
Result so far: 53356.5
The remainder is 10 after subtracting 60 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
100 divided by 12 is 8 with a remainder of 4.
The next digit of our result is 8. 
Result so far: 53356.58
If we take 96 away from 100, 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.

Step 9:
If we divide 40 by 12, we get 3 and a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 53356.583
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
If we divide 40 by 12, we get 3 and a remainder of 4.
Put 3 as the next digit of the answer. 
Result so far: 53356.5833
If we take 36 away from 40, 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.

Our division results in 53356.5833 with a remaining 4e-05.