Let's divide 123863 by 30
We want to figure out the number of times 123863 can be divided by 30.

On to step 1:
30 can be fit into 1 0 times, resulting in a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 30

Moving on to step 2:
The number 30 fits into 12 0 times, leaving a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 30

Advancing to step 3:
The number 30 fits into 123 4 times, leaving a remainder of 3.
The next digit of our result is 4. 
Result so far: 4.0
If we take 120 away from 123, we end up with 3.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 30

Advancing to step 4:
The number 30 fits into 38 1 times, leaving a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 41.0
The remainder is 8 after subtracting 30 from 38.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 30

On to step 5:
86 divided by 30 is 2 with a remainder of 26.
Record the quotient 2 as the next digit in the result. 
Result so far: 412.0
If we subtract 60 from 86, we get 26.
Include the next digit (3) from the dividend after 26, then repeat: 263 / 30

Advancing to step 6:
263 divided by 30 is 8 with a remainder of 23.
Record the quotient 8 as the next digit in the result. 
Result so far: 4128.0
Subtract 240 from 263 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 7:
If we divide 230 by 30, we get 7 and a remainder of 20.
Put 7 as the next digit of the answer. 
Result so far: 4128.7
If we subtract 210 from 230, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 8:
30 can be fit into 200 6 times, resulting in a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 4128.76
Deduct 180 from 200 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 9:
The number 30 fits into 200 6 times, leaving a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 4128.766
If we take 180 away from 200, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The quotient of the division is 4128.766, and the remainder is 0.002.