We're dividing 51405465 by 668 
We want to figure out the number of times 51405465 can be divided by 668.

Going ahead to step 1:
668 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 668

Advancing to step 2:
The number 668 fits into 51 0 times, leaving a remainder of 51.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Take the next digit (4) from the dividend and append it to 51, then repeat: 514 / 668

On to step 3:
The number 668 fits into 514 0 times, leaving a remainder of 514.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 514, we end up with 514.
Bring next digit (0) of the dividend behind the 514 and repeat the process: 5140 / 668

Going ahead to step 4:
If we divide 5140 by 668, we get 7 and a remainder of 464.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtracting 4676 from 5140 leaves us with 464.
Include the next digit (5) from the dividend after 464, then repeat: 4645 / 668

Moving on to step 5:
668 goes into 4645 6 times with a remainder of 637.
Record the quotient 6 as the next digit in the result. 
Result so far: 76.0
Subtract 4008 from 4645 to get 637.
Grab the next digit (4) from the dividend, add it to 637, then carry on: 6374 / 668

Step 6:
If we divide 6374 by 668, we get 9 and a remainder of 362.
Write down 9 as next digit of the result. 
Result so far: 769.0
Subtracting 6012 from 6374 leaves us with 362.
Take the next digit (6) from the dividend and append it to 362, then repeat: 3626 / 668

Advancing to step 7:
668 can be fit into 3626 5 times, resulting in a remainder of 286.
The number 5 becomes the next digit in our result. 
Result so far: 7695.0
Deduct 3340 from 3626 and we're left with 286.
Bring next digit (5) of the dividend behind the 286 and repeat the process: 2865 / 668

Advancing to step 8:
2865 divided by 668 is 4 with a remainder of 193.
Put 4 as the next digit of the answer. 
Result so far: 76954.0
Deduct 2672 from 2865 and we're left with 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

On to step 9:
1930 divided by 668 is 2 with a remainder of 594.
Record the quotient 2 as the next digit in the result. 
Result so far: 76954.2
Subtract 1336 from 1930 to get 594.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5940, and continue the process.

Advancing to step 10:
When dividing 5940 by 668, we get 8 with a remainder of 596.
Write down 8 as next digit of the result. 
Result so far: 76954.28
The remainder is 596 after subtracting 5344 from 5940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

On to step 11:
668 can be fit into 5960 8 times, resulting in a remainder of 616.
The next digit of our result is 8. 
Result so far: 76954.288
Subtracting 5344 from 5960 leaves us with 616.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6160, and continue the process.

The quotient of the division is 76954.288, and the remainder is 0.0616.