We're dividing 264278 by 21 
We want to divide 264278 by 21.

On to step 1:
2 divided by 21 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Take the next digit (6) from the dividend and append it to 2, then repeat: 26 / 21

Let's proceed to step 2:
The number 21 fits into 26 1 times, leaving a remainder of 5.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 21 from 26 to get 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 21

Advancing to step 3:
The number 21 fits into 54 2 times, leaving a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 42 from 54 to get 12.
Take the next digit (2) from the dividend and append it to 12, then repeat: 122 / 21

On to step 4:
122 divided by 21 is 5 with a remainder of 17.
Use 5 as the next digit of our solution. 
Result so far: 125.0
If we take 105 away from 122, we end up with 17.
Take the next digit (7) from the dividend and append it to 17, then repeat: 177 / 21

Going ahead to step 5:
21 goes into 177 8 times with a remainder of 9.
Write down 8 as next digit of the result. 
Result so far: 1258.0
If we take 168 away from 177, we end up with 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 21

Step 6:
The number 21 fits into 98 4 times, leaving a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 12584.0
If we subtract 84 from 98, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 7:
The number 21 fits into 140 6 times, leaving a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 12584.6
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
If we divide 140 by 21, we get 6 and a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 12584.66
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The quotient of the division is 12584.66, and the remainder is 0.014.