51663686 ÷ 660 
We want to divide 51663686 by 660.

On to step 1:
5 divided by 660 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 660

Let's proceed to step 2:
The number 660 fits into 51 0 times, leaving a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Include the next digit (6) from the dividend after 51, then repeat: 516 / 660

Advancing to step 3:
516 divided by 660 is 0 with a remainder of 516.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 516 leaves us with 516.
Bring next digit (6) of the dividend behind the 516 and repeat the process: 5166 / 660

On to step 4:
When dividing 5166 by 660, we get 7 with a remainder of 546.
The next digit of our result is 7. 
Result so far: 7.0
If we subtract 4620 from 5166, we get 546.
Grab the next digit (3) from the dividend, add it to 546, then carry on: 5463 / 660

Going ahead to step 5:
5463 divided by 660 is 8 with a remainder of 183.
Write down 8 as next digit of the result. 
Result so far: 78.0
Subtracting 5280 from 5463 leaves us with 183.
Grab the next digit (6) from the dividend, add it to 183, then carry on: 1836 / 660

Going ahead to step 6:
1836 divided by 660 is 2 with a remainder of 516.
Put 2 as the next digit of the answer. 
Result so far: 782.0
Subtract 1320 from 1836 to get 516.
Include the next digit (8) from the dividend after 516, then repeat: 5168 / 660

Moving on to step 7:
When dividing 5168 by 660, we get 7 with a remainder of 548.
The next digit of our result is 7. 
Result so far: 7827.0
If we take 4620 away from 5168, we end up with 548.
Take the next digit (6) from the dividend and append it to 548, then repeat: 5486 / 660

Going ahead to step 8:
When dividing 5486 by 660, we get 8 with a remainder of 206.
The number 8 becomes the next digit in our result. 
Result so far: 78278.0
If we subtract 5280 from 5486, we get 206.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2060, and continue the process.

Let's proceed to step 9:
660 can be fit into 2060 3 times, resulting in a remainder of 80.
Write down 3 as next digit of the result. 
Result so far: 78278.3
Subtract 1980 from 2060 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.

Advancing to step 10:
The number 660 fits into 800 1 times, leaving a remainder of 140.
Write down 1 as next digit of the result. 
Result so far: 78278.31
Subtracting 660 from 800 leaves us with 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 11:
660 goes into 1400 2 times with a remainder of 80.
The number 2 becomes the next digit in our result. 
Result so far: 78278.312
If we subtract 1320 from 1400, we 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 12:
When dividing 800 by 660, we get 1 with a remainder of 140.
The number 1 becomes the next digit in our result. 
Result so far: 78278.3121
If we take 660 away from 800, we end up with 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 13:
660 can be fit into 1400 2 times, resulting in a remainder of 80.
Record the quotient 2 as the next digit in the result. 
Result so far: 78278.31212
If we take 1320 away from 1400, we end up 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.

Going ahead to step 14:
660 can be fit into 800 1 times, resulting in a remainder of 140.
The number 1 becomes the next digit in our result. 
Result so far: 78278.312121
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.

Step 15:
If we divide 1400 by 660, we get 2 and a remainder of 80.
The next digit of our result is 2. 
Result so far: 78278.3121212
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:
660 can be fit into 800 1 times, resulting in a remainder of 140.
Use 1 as the next digit of our solution. 
Result so far: 78278.31212121
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.

After the division, we end up with 78278.31212121 and a remainder of 1.4e-07.