Let's divide 54287978 by 660
We're looking to find how many times 660 goes into 54287978.

Step 1:
When dividing 5 by 660, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 660

On to step 2:
When dividing 54 by 660, we get 0 with a remainder of 54.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 54 after subtracting 0 from 54.
Append the next digit (2) from the dividend to 54 and continue with: 542 / 660

Step 3:
The number 660 fits into 542 0 times, leaving a remainder of 542.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 542 and we're left with 542.
Fetch the next digit (8) from the dividend, attach it to 542 and continue: 5428 / 660

Let's proceed to step 4:
The number 660 fits into 5428 8 times, leaving a remainder of 148.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 5280 from 5428 leaves us with 148.
Include the next digit (7) from the dividend after 148, then repeat: 1487 / 660

Going ahead to step 5:
The number 660 fits into 1487 2 times, leaving a remainder of 167.
Write down 2 as next digit of the result. 
Result so far: 82.0
Subtracting 1320 from 1487 leaves us with 167.
Bring next digit (9) of the dividend behind the 167 and repeat the process: 1679 / 660

Advancing to step 6:
The number 660 fits into 1679 2 times, leaving a remainder of 359.
Use 2 as the next digit of our solution. 
Result so far: 822.0
Deduct 1320 from 1679 and we're left with 359.
Append the next digit (7) from the dividend to 359 and continue with: 3597 / 660

Moving on to step 7:
When dividing 3597 by 660, we get 5 with a remainder of 297.
The next digit of our result is 5. 
Result so far: 8225.0
If we subtract 3300 from 3597, we get 297.
Append the next digit (8) from the dividend to 297 and continue with: 2978 / 660

On to step 8:
When dividing 2978 by 660, we get 4 with a remainder of 338.
Use 4 as the next digit of our solution. 
Result so far: 82254.0
Deduct 2640 from 2978 and we're left with 338.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3380, and continue the process.

Moving on to step 9:
When dividing 3380 by 660, we get 5 with a remainder of 80.
The next digit of our result is 5. 
Result so far: 82254.5
Subtract 3300 from 3380 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 10:
660 can be fit into 800 1 times, resulting in a remainder of 140.
Record the quotient 1 as the next digit in the result. 
Result so far: 82254.51
If we subtract 660 from 800, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 11:
1400 divided by 660 is 2 with a remainder of 80.
The number 2 becomes the next digit in our result. 
Result so far: 82254.512
Subtracting 1320 from 1400 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 12:
800 divided by 660 is 1 with a remainder of 140.
Write down 1 as next digit of the result. 
Result so far: 82254.5121
The remainder is 140 after subtracting 660 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Moving on to step 13:
660 goes into 1400 2 times with a remainder of 80.
Use 2 as the next digit of our solution. 
Result so far: 82254.51212
Subtracting 1320 from 1400 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Let's proceed to step 14:
660 can be fit into 800 1 times, resulting in a remainder of 140.
Record the quotient 1 as the next digit in the result. 
Result so far: 82254.512121
If we subtract 660 from 800, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 15:
660 goes into 1400 2 times with a remainder of 80.
The number 2 becomes the next digit in our result. 
Result so far: 82254.5121212
The remainder is 80 after subtracting 1320 from 1400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Step 16:
800 divided by 660 is 1 with a remainder of 140.
The next digit of our result is 1. 
Result so far: 82254.51212121
Subtract 660 from 800 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The final outcome is 82254.51212121, with a leftover of 1.4e-07.