We look at the division of 21239 by 8 
Our goal is to divide 21239 by 8.

Moving on to step 1:
If we divide 2 by 8, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 8

On to step 2:
When dividing 21 by 8, we get 2 with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 2.0
Deduct 16 from 21 and we're left with 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 8

Moving on to step 3:
The number 8 fits into 52 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 26.0
Subtract 48 from 52 to get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 8

Going ahead to step 4:
If we divide 43 by 8, we get 5 and a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 265.0
Deduct 40 from 43 and we're left with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 8

Step 5:
39 divided by 8 is 4 with a remainder of 7.
Record the quotient 4 as the next digit in the result. 
Result so far: 2654.0
If we subtract 32 from 39, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 6:
70 divided by 8 is 8 with a remainder of 6.
The next digit of our result is 8. 
Result so far: 2654.8
Subtract 64 from 70 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 7:
When dividing 60 by 8, we get 7 with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 2654.87
Subtracting 56 from 60 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 8:
40 divided by 8 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 2654.875
The remainder is 0 after subtracting 40 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
The number 8 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 2654.875
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.

Moving on to step 10:
0 divided by 8 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 2654.875
If we subtract 0 from 0, 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.

The final result is 2654.875 with a remainder of 0.0.