We're dividing 343986 by 15 
We want to divide 343986 by 15.

Advancing to step 1:
15 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 15

Advancing to step 2:
When dividing 34 by 15, we get 2 with a remainder of 4.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 30 from 34 to get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 15

Step 3:
When dividing 43 by 15, we get 2 with a remainder of 13.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
The remainder is 13 after subtracting 30 from 43.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 15

Let's proceed to step 4:
If we divide 139 by 15, we get 9 and a remainder of 4.
Record the quotient 9 as the next digit in the result. 
Result so far: 229.0
Subtract 135 from 139 to get 4.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 15

Advancing to step 5:
If we divide 48 by 15, we get 3 and a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 2293.0
Subtract 45 from 48 to get 3.
Take the next digit (6) from the dividend and append it to 3, then repeat: 36 / 15

Advancing to step 6:
The number 15 fits into 36 2 times, leaving a remainder of 6.
The next digit of our result is 2. 
Result so far: 22932.0
Subtract 30 from 36 to 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.

Let's proceed to step 7:
When dividing 60 by 15, we get 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 22932.4
Subtracting 60 from 60 leaves us 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.

Going ahead to step 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 22932.4
Subtracting 0 from 0 leaves us 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.

Going ahead to step 9:
15 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 22932.4
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.

The final outcome is 22932.4, with a leftover of 0.0.