We're dividing 688800 by 54 
Let's see how many times 54 fits into 688800.

Step 1:
When dividing 6 by 54, we get 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 54

On to step 2:
When dividing 68 by 54, we get 1 with a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 54 away from 68, we end up with 14.
Append the next digit (8) from the dividend to 14 and continue with: 148 / 54

On to step 3:
If we divide 148 by 54, we get 2 and a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 12.0
The remainder is 40 after subtracting 108 from 148.
Grab the next digit (8) from the dividend, add it to 40, then carry on: 408 / 54

Let's proceed to step 4:
The number 54 fits into 408 7 times, leaving a remainder of 30.
Use 7 as the next digit of our solution. 
Result so far: 127.0
If we take 378 away from 408, we end up with 30.
Include the next digit (0) from the dividend after 30, then repeat: 300 / 54

Moving on to step 5:
The number 54 fits into 300 5 times, leaving a remainder of 30.
The next digit of our result is 5. 
Result so far: 1275.0
Subtracting 270 from 300 leaves us with 30.
Include the next digit (0) from the dividend after 30, then repeat: 300 / 54

Moving on to step 6:
300 divided by 54 is 5 with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 12755.0
Deduct 270 from 300 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.

Going ahead to step 7:
If we divide 300 by 54, we get 5 and a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 12755.5
If we subtract 270 from 300, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
The number 54 fits into 300 5 times, leaving a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 12755.55
Subtracting 270 from 300 leaves us 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.

The final result is 12755.55 with a remainder of 0.03.