We're dividing 545590 by 12 
We want to figure out the number of times 545590 can be divided by 12.

On to step 1:
When dividing 5 by 12, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 12

Let's proceed to step 2:
When dividing 54 by 12, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we take 48 away from 54, we end up with 6.
Include the next digit (5) from the dividend after 6, then repeat: 65 / 12

Step 3:
65 divided by 12 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
The remainder is 5 after subtracting 60 from 65.
Grab the next digit (5) from the dividend, add it to 5, then carry on: 55 / 12

Advancing to step 4:
12 can be fit into 55 4 times, resulting in a remainder of 7.
Write down 4 as next digit of the result. 
Result so far: 454.0
Deduct 48 from 55 and we're left with 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 12

On 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: 4546.0
Subtract 72 from 79 to get 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 12

Going ahead to step 6:
If we divide 70 by 12, we get 5 and a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 45465.0
Subtract 60 from 70 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 7:
If we divide 100 by 12, we get 8 and a remainder of 4.
The next digit of our result is 8. 
Result so far: 45465.8
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.

Advancing to step 8:
When dividing 40 by 12, we get 3 with a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 45465.83
Deduct 36 from 40 and we're left 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.

Let's proceed to step 9:
40 divided by 12 is 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 45465.833
Subtract 36 from 40 to 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.

The quotient of the division is 45465.833, and the remainder is 0.0004.