We're dividing 340340 by 21 
Our goal is to divide 340340 by 21.

Let's proceed to step 1:
21 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (4) from the dividend, attach it to 3 and continue: 34 / 21

On to step 2:
When dividing 34 by 21, we get 1 with a remainder of 13.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 21 from 34, we get 13.
Take the next digit (0) from the dividend and append it to 13, then repeat: 130 / 21

Step 3:
21 goes into 130 6 times with a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 16.0
Subtracting 126 from 130 leaves us with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 21

Going ahead to step 4:
21 can be fit into 43 2 times, resulting in a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 162.0
If we subtract 42 from 43, we get 1.
Take the next digit (4) from the dividend and append it to 1, then repeat: 14 / 21

Moving on to step 5:
21 goes into 14 0 times with a remainder of 14.
Write down 0 as next digit of the result. 
Result so far: 1620.0
If we subtract 0 from 14, we get 14.
Bring next digit (0) of the dividend behind the 14 and repeat the process: 140 / 21

On to step 6:
The number 21 fits into 140 6 times, leaving a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 16206.0
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 7:
140 divided by 21 is 6 with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 16206.6
Subtracting 126 from 140 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 8:
When dividing 140 by 21, we get 6 with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 16206.66
Subtract 126 from 140 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 16206.66, with a leftover of 0.014.