340353 ÷ 12 
We want to divide 340353 by 12.

Step 1:
The number 12 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 12

Advancing to step 2:
If we divide 34 by 12, we get 2 and a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
If we take 24 away from 34, we end up with 10.
Include the next digit (0) from the dividend after 10, then repeat: 100 / 12

Advancing to step 3:
When dividing 100 by 12, we get 8 with a remainder of 4.
The next digit of our result is 8. 
Result so far: 28.0
Subtracting 96 from 100 leaves us with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 12

Step 4:
43 divided by 12 is 3 with a remainder of 7.
The next digit of our result is 3. 
Result so far: 283.0
Subtract 36 from 43 to get 7.
Grab the next digit (5) from the dividend, add it to 7, then carry on: 75 / 12

On to step 5:
12 can be fit into 75 6 times, resulting in a remainder of 3.
The number 6 becomes the next digit in our result. 
Result so far: 2836.0
If we take 72 away from 75, we end up with 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 12

Advancing to step 6:
12 can be fit into 33 2 times, resulting in a remainder of 9.
Record the quotient 2 as the next digit in the result. 
Result so far: 28362.0
If we take 24 away from 33, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 7:
12 can be fit into 90 7 times, resulting in a remainder of 6.
The next digit of our result is 7. 
Result so far: 28362.7
If we subtract 84 from 90, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
60 divided by 12 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 28362.75
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.

On to step 9:
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: 28362.75
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
12 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 28362.75
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 28362.75 and a remainder of 0.0.