437900 ÷ 12 
We're looking to find how many times 12 goes into 437900.

Let's proceed to step 1:
12 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 12

Going ahead to step 2:
12 goes into 43 3 times with a remainder of 7.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 36 from 43 and we're left with 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 12

On to step 3:
The number 12 fits into 77 6 times, leaving a remainder of 5.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
If we take 72 away from 77, we end up with 5.
Append the next digit (9) from the dividend to 5 and continue with: 59 / 12

On to step 4:
If we divide 59 by 12, we get 4 and a remainder of 11.
Record the quotient 4 as the next digit in the result. 
Result so far: 364.0
Subtracting 48 from 59 leaves us with 11.
Grab the next digit (0) from the dividend, add it to 11, then carry on: 110 / 12

Step 5:
If we divide 110 by 12, we get 9 and a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 3649.0
Subtract 108 from 110 to get 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 12

Advancing 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: 36491.0
If we subtract 12 from 20, 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.

Advancing to step 7:
When dividing 80 by 12, we get 6 with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 36491.6
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.

Moving on to step 8:
12 goes into 80 6 times with a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 36491.66
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.

After the division, we end up with 36491.66 and a remainder of 0.008.