521441 ÷ 12 
The aim is to understand the frequency of 12 in 521441.

Moving on to step 1:
5 divided by 12 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 12

Step 2:
The number 12 fits into 52 4 times, leaving a remainder of 4.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 48 from 52, we get 4.
Append the next digit (1) from the dividend to 4 and continue with: 41 / 12

On to step 3:
When dividing 41 by 12, we get 3 with a remainder of 5.
The next digit of our result is 3. 
Result so far: 43.0
Subtracting 36 from 41 leaves us with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 12

Advancing to step 4:
54 divided by 12 is 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 434.0
If we subtract 48 from 54, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 12

On to step 5:
64 divided by 12 is 5 with a remainder of 4.
Record the quotient 5 as the next digit in the result. 
Result so far: 4345.0
The remainder is 4 after subtracting 60 from 64.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 12

Moving on to step 6:
41 divided by 12 is 3 with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 43453.0
Subtracting 36 from 41 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
The number 12 fits into 50 4 times, leaving a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 43453.4
The remainder is 2 after subtracting 48 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
20 divided by 12 is 1 with a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 43453.41
If we take 12 away from 20, 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.

Step 9:
80 divided by 12 is 6 with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 43453.416
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: 43453.4166
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.

In conclusion, the division gives 43453.4166 with a balance of 8e-05.