We're dividing 580900 by 12 
We want to figure out the number of times 580900 can be divided by 12.

Let's proceed to step 1:
12 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (8) from the dividend after 5, then repeat: 58 / 12

Going ahead to step 2:
12 goes into 58 4 times with a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 48 away from 58, we end up with 10.
Bring next digit (0) of the dividend behind the 10 and repeat the process: 100 / 12

Advancing to step 3:
100 divided by 12 is 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 48.0
If we take 96 away from 100, we end up with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 12

Advancing to step 4:
49 divided by 12 is 4 with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 484.0
Deduct 48 from 49 and we're left with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 12

Step 5:
The number 12 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 4840.0
Deduct 0 from 10 and we're left with 10.
Grab the next digit (0) from the dividend, add it to 10, then carry on: 100 / 12

Going ahead to step 6:
12 goes into 100 8 times with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 48408.0
If we subtract 96 from 100, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 7:
12 goes into 40 3 times with a remainder of 4.
Write down 3 as next digit of the result. 
Result so far: 48408.3
Subtracting 36 from 40 leaves us 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.

Going ahead to step 8:
The number 12 fits into 40 3 times, leaving a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 48408.33
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.

After the division, we end up with 48408.33 and a remainder of 0.004.