Let's divide 42470 by 12
Let's see how many times 12 fits into 42470.

Advancing to step 1:
12 goes into 4 0 times with 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.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 12

Going ahead to step 2:
12 goes into 42 3 times with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we subtract 36 from 42, we get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 12

Let's proceed to step 3:
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: 35.0
Deduct 60 from 64 and we're left with 4.
Fetch the next digit (7) from the dividend, attach it to 4 and continue: 47 / 12

Advancing to step 4:
If we divide 47 by 12, we get 3 and a remainder of 11.
The next digit of our result is 3. 
Result so far: 353.0
Subtract 36 from 47 to get 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 12

Step 5:
12 can be fit into 110 9 times, resulting in a remainder of 2.
The next digit of our result is 9. 
Result so far: 3539.0
Deduct 108 from 110 and we're left 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.

Moving on to step 6:
If we divide 20 by 12, we get 1 and a remainder of 8.
Write down 1 as next digit of the result. 
Result so far: 3539.1
Deduct 12 from 20 and we're left 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.

On to step 7:
If we divide 80 by 12, we get 6 and a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 3539.16
Deduct 72 from 80 and we're left 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.

Going ahead to step 8:
12 can be fit into 80 6 times, resulting in a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 3539.166
If we subtract 72 from 80, we 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 final result is 3539.166 with a remainder of 0.0008.