We divide 521591 by 12
We want to divide 521591 by 12.

On to step 1:
12 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 12

Going ahead to step 2:
52 divided by 12 is 4 with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 48 from 52, we get 4.
Include the next digit (1) from the dividend after 4, then repeat: 41 / 12

Let's proceed to step 3:
If we divide 41 by 12, we get 3 and a remainder of 5.
The next digit of our result is 3. 
Result so far: 43.0
The remainder is 5 after subtracting 36 from 41.
Append the next digit (5) from the dividend to 5 and continue with: 55 / 12

Going ahead to step 4:
55 divided by 12 is 4 with a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 434.0
If we subtract 48 from 55, we get 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 12

Let's proceed to step 5:
The number 12 fits into 79 6 times, leaving a remainder of 7.
Write down 6 as next digit of the result. 
Result so far: 4346.0
If we subtract 72 from 79, we get 7.
Grab the next digit (1) from the dividend, add it to 7, then carry on: 71 / 12

Advancing to step 6:
12 can be fit into 71 5 times, resulting in a remainder of 11.
The number 5 becomes the next digit in our result. 
Result so far: 43465.0
Subtracting 60 from 71 leaves us with 11.
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:
The number 12 fits into 110 9 times, leaving a remainder of 2.
The next digit of our result is 9. 
Result so far: 43465.9
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:
If we divide 20 by 12, we get 1 and a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 43465.91
The remainder is 8 after subtracting 12 from 20.
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:
80 divided by 12 is 6 with a remainder of 8.
The next digit of our result is 6. 
Result so far: 43465.916
Subtracting 72 from 80 leaves us 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 10:
The number 12 fits into 80 6 times, leaving a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 43465.9166
Subtract 72 from 80 to 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.

The quotient of the division is 43465.9166, and the remainder is 8e-05.