120003 divided by 45 
We want to divide 120003 by 45.

On to step 1:
If we divide 1 by 45, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 45

Moving on to step 2:
45 can be fit into 12 0 times, resulting in a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 12 and we're left with 12.
Fetch the next digit (0) from the dividend, attach it to 12 and continue: 120 / 45

Let's proceed to step 3:
45 goes into 120 2 times with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 90 from 120 and we're left with 30.
Append the next digit (0) from the dividend to 30 and continue with: 300 / 45

Let's proceed to step 4:
45 can be fit into 300 6 times, resulting in a remainder of 30.
The next digit of our result is 6. 
Result so far: 26.0
The remainder is 30 after subtracting 270 from 300.
Append the next digit (0) from the dividend to 30 and continue with: 300 / 45

Moving on to step 5:
When dividing 300 by 45, we get 6 with a remainder of 30.
Put 6 as the next digit of the answer. 
Result so far: 266.0
Subtracting 270 from 300 leaves us with 30.
Grab the next digit (3) from the dividend, add it to 30, then carry on: 303 / 45

Moving on to step 6:
The number 45 fits into 303 6 times, leaving a remainder of 33.
Put 6 as the next digit of the answer. 
Result so far: 2666.0
Subtracting 270 from 303 leaves us with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Let's proceed to step 7:
If we divide 330 by 45, we get 7 and a remainder of 15.
Write down 7 as next digit of the result. 
Result so far: 2666.7
The remainder is 15 after subtracting 315 from 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 8:
The number 45 fits into 150 3 times, leaving a remainder of 15.
The number 3 becomes the next digit in our result. 
Result so far: 2666.73
If we take 135 away from 150, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 9:
The number 45 fits into 150 3 times, leaving a remainder of 15.
The next digit of our result is 3. 
Result so far: 2666.733
Subtract 135 from 150 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Our division results in 2666.733 with a remaining 0.0015.