Let's divide 340123 by 30
We're looking to find how many times 30 goes into 340123.

On to step 1:
30 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 subtract 0 from 3, we get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 30

Moving on to step 2:
30 goes into 34 1 times with a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 30 from 34 leaves us with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 30

Advancing to step 3:
30 goes into 40 1 times with a remainder of 10.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Subtracting 30 from 40 leaves us with 10.
Fetch the next digit (1) from the dividend, attach it to 10 and continue: 101 / 30

Advancing to step 4:
The number 30 fits into 101 3 times, leaving a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 113.0
Deduct 90 from 101 and we're left with 11.
Append the next digit (2) from the dividend to 11 and continue with: 112 / 30

Advancing to step 5:
The number 30 fits into 112 3 times, leaving a remainder of 22.
Record the quotient 3 as the next digit in the result. 
Result so far: 1133.0
Deduct 90 from 112 and we're left with 22.
Bring next digit (3) of the dividend behind the 22 and repeat the process: 223 / 30

Going ahead to step 6:
30 can be fit into 223 7 times, resulting in a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 11337.0
Deduct 210 from 223 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 7:
30 goes into 130 4 times with a remainder of 10.
The number 4 becomes the next digit in our result. 
Result so far: 11337.4
The remainder is 10 after subtracting 120 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
The number 30 fits into 100 3 times, leaving a remainder of 10.
Use 3 as the next digit of our solution. 
Result so far: 11337.43
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 9:
The number 30 fits into 100 3 times, leaving a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 11337.433
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The quotient of the division is 11337.433, and the remainder is 0.001.