We look at the division of 343990 by 10 
We want to divide 343990 by 10.

Going ahead to step 1:
If we divide 3 by 10, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 10

Moving on to step 2:
The number 10 fits into 34 3 times, leaving a remainder of 4.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 30 from 34 to get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 10

On to step 3:
When dividing 43 by 10, we get 4 with a remainder of 3.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we subtract 40 from 43, we get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 10

Going ahead to step 4:
10 goes into 39 3 times with a remainder of 9.
The next digit of our result is 3. 
Result so far: 343.0
If we subtract 30 from 39, we get 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 10

Going ahead to step 5:
99 divided by 10 is 9 with a remainder of 9.
Record the quotient 9 as the next digit in the result. 
Result so far: 3439.0
The remainder is 9 after subtracting 90 from 99.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 10

Going ahead to step 6:
10 can be fit into 90 9 times, resulting in a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 34399.0
Subtracting 90 from 90 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 7:
When dividing 0 by 10, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 34399.0
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.

On to step 8:
10 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 34399.0
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.

Our division results in 34399.0 with a remaining 0.0.