We're dividing 25216288 by 866 
Let's see how many times 866 fits into 25216288.

Going ahead to step 1:
When dividing 2 by 866, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 866

Step 2:
When dividing 25 by 866, we get 0 with a remainder of 25.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 25 leaves us with 25.
Bring next digit (2) of the dividend behind the 25 and repeat the process: 252 / 866

Going ahead to step 3:
The number 866 fits into 252 0 times, leaving a remainder of 252.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 252, we end up with 252.
Fetch the next digit (1) from the dividend, attach it to 252 and continue: 2521 / 866

Advancing to step 4:
If we divide 2521 by 866, we get 2 and a remainder of 789.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 1732 from 2521 to get 789.
Include the next digit (6) from the dividend after 789, then repeat: 7896 / 866

On to step 5:
The number 866 fits into 7896 9 times, leaving a remainder of 102.
Write down 9 as next digit of the result. 
Result so far: 29.0
Subtracting 7794 from 7896 leaves us with 102.
Append the next digit (2) from the dividend to 102 and continue with: 1022 / 866

Step 6:
If we divide 1022 by 866, we get 1 and a remainder of 156.
The next digit of our result is 1. 
Result so far: 291.0
If we take 866 away from 1022, we end up with 156.
Include the next digit (8) from the dividend after 156, then repeat: 1568 / 866

On to step 7:
866 goes into 1568 1 times with a remainder of 702.
Write down 1 as next digit of the result. 
Result so far: 2911.0
If we subtract 866 from 1568, we get 702.
Bring next digit (8) of the dividend behind the 702 and repeat the process: 7028 / 866

Advancing to step 8:
The number 866 fits into 7028 8 times, leaving a remainder of 100.
The number 8 becomes the next digit in our result. 
Result so far: 29118.0
The remainder is 100 after subtracting 6928 from 7028.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Moving on to step 9:
If we divide 1000 by 866, we get 1 and a remainder of 134.
Put 1 as the next digit of the answer. 
Result so far: 29118.1
Subtract 866 from 1000 to get 134.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1340, and continue the process.

Moving on to step 10:
When dividing 1340 by 866, we get 1 with a remainder of 474.
Use 1 as the next digit of our solution. 
Result so far: 29118.11
Subtract 866 from 1340 to get 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4740, and continue the process.

The final result is 29118.11 with a remainder of 0.474.