343178 ÷ 12 
We're looking to find how many times 12 goes into 343178.

On to step 1:
12 goes into 3 0 times with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 12

Advancing to step 2:
The number 12 fits into 34 2 times, leaving a remainder of 10.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 24 from 34 leaves us with 10.
Take the next digit (3) from the dividend and append it to 10, then repeat: 103 / 12

Moving on to step 3:
12 can be fit into 103 8 times, resulting in a remainder of 7.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
Subtracting 96 from 103 leaves us with 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 12

Let's proceed to step 4:
12 can be fit into 71 5 times, resulting in a remainder of 11.
Use 5 as the next digit of our solution. 
Result so far: 285.0
Subtracting 60 from 71 leaves us with 11.
Bring next digit (7) of the dividend behind the 11 and repeat the process: 117 / 12

Advancing to step 5:
The number 12 fits into 117 9 times, leaving a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 2859.0
The remainder is 9 after subtracting 108 from 117.
Grab the next digit (8) from the dividend, add it to 9, then carry on: 98 / 12

Going ahead to step 6:
When dividing 98 by 12, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 28598.0
Deduct 96 from 98 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.

On to step 7:
12 goes into 20 1 times with a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 28598.1
If we take 12 away from 20, we end up 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.

Advancing to step 8:
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: 28598.16
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.

On to step 9:
12 goes into 80 6 times with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 28598.166
The remainder is 8 after subtracting 72 from 80.
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 outcome is 28598.166, with a leftover of 0.0008.