54072840 divided by 646 
We want to divide 54072840 by 646.

Advancing to step 1:
5 divided by 646 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 646

Let's proceed to step 2:
646 can be fit into 54 0 times, resulting in a remainder of 54.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 54 after subtracting 0 from 54.
Take the next digit (0) from the dividend and append it to 54, then repeat: 540 / 646

Advancing to step 3:
The number 646 fits into 540 0 times, leaving a remainder of 540.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 540, we get 540.
Grab the next digit (7) from the dividend, add it to 540, then carry on: 5407 / 646

Advancing to step 4:
5407 divided by 646 is 8 with a remainder of 239.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 5168 from 5407 leaves us with 239.
Append the next digit (2) from the dividend to 239 and continue with: 2392 / 646

Step 5:
646 can be fit into 2392 3 times, resulting in a remainder of 454.
Record the quotient 3 as the next digit in the result. 
Result so far: 83.0
If we take 1938 away from 2392, we end up with 454.
Take the next digit (8) from the dividend and append it to 454, then repeat: 4548 / 646

On to step 6:
When dividing 4548 by 646, we get 7 with a remainder of 26.
The next digit of our result is 7. 
Result so far: 837.0
Subtract 4522 from 4548 to get 26.
Bring next digit (4) of the dividend behind the 26 and repeat the process: 264 / 646

Going ahead to step 7:
646 goes into 264 0 times with a remainder of 264.
Record the quotient 0 as the next digit in the result. 
Result so far: 8370.0
Subtract 0 from 264 to get 264.
Fetch the next digit (0) from the dividend, attach it to 264 and continue: 2640 / 646

Advancing to step 8:
The number 646 fits into 2640 4 times, leaving a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 83704.0
Subtract 2584 from 2640 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 9:
646 can be fit into 560 0 times, resulting in a remainder of 560.
Put 0 as the next digit of the answer. 
Result so far: 83704.0
Deduct 0 from 560 and we're left with 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Let's proceed to step 10:
646 can be fit into 5600 8 times, resulting in a remainder of 432.
Record the quotient 8 as the next digit in the result. 
Result so far: 83704.08
If we subtract 5168 from 5600, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Step 11:
The number 646 fits into 4320 6 times, leaving a remainder of 444.
Write down 6 as next digit of the result. 
Result so far: 83704.086
The remainder is 444 after subtracting 3876 from 4320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4440, and continue the process.

Step 12:
If we divide 4440 by 646, we get 6 and a remainder of 564.
Write down 6 as next digit of the result. 
Result so far: 83704.0866
Subtracting 3876 from 4440 leaves us with 564.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5640, and continue the process.

Our division results in 83704.0866 with a remaining 0.00564.