645810 divided by 54 
We're looking to find how many times 54 goes into 645810.

Moving on to step 1:
If we divide 6 by 54, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 54

On to step 2:
64 divided by 54 is 1 with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 54 away from 64, we end up with 10.
Fetch the next digit (5) from the dividend, attach it to 10 and continue: 105 / 54

Going ahead to step 3:
54 goes into 105 1 times with a remainder of 51.
Use 1 as the next digit of our solution. 
Result so far: 11.0
The remainder is 51 after subtracting 54 from 105.
Bring next digit (8) of the dividend behind the 51 and repeat the process: 518 / 54

Moving on to step 4:
518 divided by 54 is 9 with a remainder of 32.
The next digit of our result is 9. 
Result so far: 119.0
Subtracting 486 from 518 leaves us with 32.
Take the next digit (1) from the dividend and append it to 32, then repeat: 321 / 54

Let's proceed to step 5:
54 can be fit into 321 5 times, resulting in a remainder of 51.
Use 5 as the next digit of our solution. 
Result so far: 1195.0
The remainder is 51 after subtracting 270 from 321.
Include the next digit (0) from the dividend after 51, then repeat: 510 / 54

On to step 6:
The number 54 fits into 510 9 times, leaving a remainder of 24.
Write down 9 as next digit of the result. 
Result so far: 11959.0
The remainder is 24 after subtracting 486 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 7:
240 divided by 54 is 4 with a remainder of 24.
Use 4 as the next digit of our solution. 
Result so far: 11959.4
Deduct 216 from 240 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 8:
The number 54 fits into 240 4 times, leaving a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 11959.44
Subtract 216 from 240 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The final result is 11959.44 with a remainder of 0.024.