Let's divide 521867 by 12
The aim is to understand the frequency of 12 in 521867.

Step 1:
12 goes into 5 0 times with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 12

Step 2:
If we divide 52 by 12, we get 4 and a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 48 from 52 to get 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 12

On to step 3:
If we divide 41 by 12, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 43.0
If we subtract 36 from 41, we get 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 12

Step 4:
The number 12 fits into 58 4 times, leaving a remainder of 10.
Use 4 as the next digit of our solution. 
Result so far: 434.0
The remainder is 10 after subtracting 48 from 58.
Fetch the next digit (6) from the dividend, attach it to 10 and continue: 106 / 12

Going ahead to step 5:
106 divided by 12 is 8 with a remainder of 10.
Record the quotient 8 as the next digit in the result. 
Result so far: 4348.0
If we take 96 away from 106, we end up with 10.
Bring next digit (7) of the dividend behind the 10 and repeat the process: 107 / 12

Moving on to step 6:
When dividing 107 by 12, we get 8 with a remainder of 11.
The number 8 becomes the next digit in our result. 
Result so far: 43488.0
The remainder is 11 after subtracting 96 from 107.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 7:
If we divide 110 by 12, we get 9 and a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 43488.9
If we take 108 away from 110, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
20 divided by 12 is 1 with a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 43488.91
If we subtract 12 from 20, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 9:
12 can be fit into 80 6 times, resulting in a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 43488.916
The remainder is 8 after subtracting 72 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 10:
If we divide 80 by 12, we get 6 and a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 43488.9166
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final result is 43488.9166 with a remainder of 8e-05.