We're dividing 122403 by 2 
Let's see how many times 2 fits into 122403.

On to step 1:
The number 2 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 2

On to step 2:
12 divided by 2 is 6 with a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
Subtracting 12 from 12 leaves us with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 2

On to step 3:
2 divided by 2 is 1 with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 61.0
Subtracting 2 from 2 leaves us with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 2

Advancing to step 4:
The number 2 fits into 4 2 times, leaving a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 612.0
If we take 4 away from 4, we end up with 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 2

Let's proceed to step 5:
2 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 6120.0
If we subtract 0 from 0, we get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 2

Moving on to step 6:
When dividing 3 by 2, we get 1 with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 61201.0
If we subtract 2 from 3, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
2 goes into 10 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 61201.5
If we subtract 10 from 10, we get 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:
If we divide 0 by 2, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 61201.5
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.

On to step 9:
If we divide 0 by 2, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 61201.5
Subtract 0 from 0 to get 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 result is 61201.5 with a remainder of 0.0.