21123 divided by 75 
We want to divide 21123 by 75.

On to step 1:
75 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 75

Going ahead to step 2:
75 can be fit into 21 0 times, resulting in a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Bring next digit (1) of the dividend behind the 21 and repeat the process: 211 / 75

Advancing to step 3:
75 can be fit into 211 2 times, resulting in a remainder of 61.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 150 from 211 and we're left with 61.
Take the next digit (2) from the dividend and append it to 61, then repeat: 612 / 75

Let's proceed to step 4:
The number 75 fits into 612 8 times, leaving a remainder of 12.
The next digit of our result is 8. 
Result so far: 28.0
Subtracting 600 from 612 leaves us with 12.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 75

Moving on to step 5:
123 divided by 75 is 1 with a remainder of 48.
Put 1 as the next digit of the answer. 
Result so far: 281.0
Subtracting 75 from 123 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 6:
When dividing 480 by 75, we get 6 with a remainder of 30.
Put 6 as the next digit of the answer. 
Result so far: 281.6
Deduct 450 from 480 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 7:
The number 75 fits into 300 4 times, leaving a remainder of 0.
The next digit of our result is 4. 
Result so far: 281.64
If we subtract 300 from 300, 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 75, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 281.64
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.

Step 9:
When dividing 0 by 75, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 281.64
The remainder is 0 after subtracting 0 from 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 outcome is 281.64, with a leftover of 0.0.