Let's divide 421740 by 12
Let's see how many times 12 fits into 421740.

Moving on to step 1:
If we divide 4 by 12, we get 0 and a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 12

Going ahead to step 2:
12 can be fit into 42 3 times, resulting in a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 36 from 42 to get 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 12

Step 3:
When dividing 61 by 12, we get 5 with a remainder of 1.
The next digit of our result is 5. 
Result so far: 35.0
If we take 60 away from 61, we end up with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 12

Moving on to step 4:
The number 12 fits into 17 1 times, leaving a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 351.0
If we subtract 12 from 17, we get 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 12

Step 5:
When dividing 54 by 12, we get 4 with a remainder of 6.
The next digit of our result is 4. 
Result so far: 3514.0
Deduct 48 from 54 and we're left with 6.
Include the next digit (0) from the dividend after 6, then repeat: 60 / 12

On to step 6:
12 goes into 60 5 times with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 35145.0
Subtract 60 from 60 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
If we divide 0 by 12, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 35145.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
0 divided by 12 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 35145.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 35145.0 with a balance of 0.0.