666864 ÷ 51 
Let's see how many times 51 fits into 666864.

On to step 1:
51 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 51

Step 2:
If we divide 66 by 51, we get 1 and a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 51 from 66 leaves us with 15.
Append the next digit (6) from the dividend to 15 and continue with: 156 / 51

Moving on to step 3:
The number 51 fits into 156 3 times, leaving a remainder of 3.
The next digit of our result is 3. 
Result so far: 13.0
Subtracting 153 from 156 leaves us with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 51

Moving on to step 4:
The number 51 fits into 38 0 times, leaving a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 130.0
Subtracting 0 from 38 leaves us with 38.
Grab the next digit (6) from the dividend, add it to 38, then carry on: 386 / 51

Let's proceed to step 5:
The number 51 fits into 386 7 times, leaving a remainder of 29.
Put 7 as the next digit of the answer. 
Result so far: 1307.0
Deduct 357 from 386 and we're left with 29.
Bring next digit (4) of the dividend behind the 29 and repeat the process: 294 / 51

Advancing to step 6:
51 goes into 294 5 times with a remainder of 39.
The next digit of our result is 5. 
Result so far: 13075.0
Deduct 255 from 294 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Going ahead to step 7:
51 goes into 390 7 times with a remainder of 33.
Put 7 as the next digit of the answer. 
Result so far: 13075.7
The remainder is 33 after subtracting 357 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 8:
When dividing 330 by 51, we get 6 with a remainder of 24.
Write down 6 as next digit of the result. 
Result so far: 13075.76
Subtract 306 from 330 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.

Going ahead to step 9:
51 goes into 240 4 times with a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 13075.764
If we take 204 away from 240, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 10:
The number 51 fits into 360 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 13075.7647
Subtract 357 from 360 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 11:
51 goes into 30 0 times with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 13075.7647
Subtracting 0 from 30 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.

Advancing to step 12:
The number 51 fits into 300 5 times, leaving a remainder of 45.
The next digit of our result is 5. 
Result so far: 13075.764705
Subtracting 255 from 300 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 13:
51 goes into 450 8 times with a remainder of 42.
Write down 8 as next digit of the result. 
Result so far: 13075.7647058
The remainder is 42 after subtracting 408 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 14:
If we divide 420 by 51, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 13075.76470588
Subtracting 408 from 420 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 13075.76470588, and the remainder is 1.2e-08.