We look at the division of 51906921 by 666 
Our goal is to divide 51906921 by 666.

On to step 1:
The number 666 fits into 5 0 times, leaving a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 666

Let's proceed to step 2:
666 goes into 51 0 times with a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 51 leaves us with 51.
Include the next digit (9) from the dividend after 51, then repeat: 519 / 666

Let's proceed to step 3:
666 goes into 519 0 times with a remainder of 519.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 519 leaves us with 519.
Take the next digit (0) from the dividend and append it to 519, then repeat: 5190 / 666

Advancing to step 4:
When dividing 5190 by 666, we get 7 with a remainder of 528.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we take 4662 away from 5190, we end up with 528.
Take the next digit (6) from the dividend and append it to 528, then repeat: 5286 / 666

Moving on to step 5:
If we divide 5286 by 666, we get 7 and a remainder of 624.
Write down 7 as next digit of the result. 
Result so far: 77.0
Subtracting 4662 from 5286 leaves us with 624.
Include the next digit (9) from the dividend after 624, then repeat: 6249 / 666

Advancing to step 6:
The number 666 fits into 6249 9 times, leaving a remainder of 255.
Use 9 as the next digit of our solution. 
Result so far: 779.0
Deduct 5994 from 6249 and we're left with 255.
Include the next digit (2) from the dividend after 255, then repeat: 2552 / 666

Let's proceed to step 7:
2552 divided by 666 is 3 with a remainder of 554.
Use 3 as the next digit of our solution. 
Result so far: 7793.0
Subtracting 1998 from 2552 leaves us with 554.
Append the next digit (1) from the dividend to 554 and continue with: 5541 / 666

Moving on to step 8:
666 can be fit into 5541 8 times, resulting in a remainder of 213.
The next digit of our result is 8. 
Result so far: 77938.0
Subtracting 5328 from 5541 leaves us with 213.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Moving on to step 9:
666 goes into 2130 3 times with a remainder of 132.
Put 3 as the next digit of the answer. 
Result so far: 77938.3
The remainder is 132 after subtracting 1998 from 2130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Going ahead to step 10:
666 goes into 1320 1 times with a remainder of 654.
Write down 1 as next digit of the result. 
Result so far: 77938.31
If we take 666 away from 1320, we end up with 654.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6540, and continue the process.

Let's proceed to step 11:
6540 divided by 666 is 9 with a remainder of 546.
Record the quotient 9 as the next digit in the result. 
Result so far: 77938.319
Subtracting 5994 from 6540 leaves us with 546.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Advancing to step 12:
666 can be fit into 5460 8 times, resulting in a remainder of 132.
The number 8 becomes the next digit in our result. 
Result so far: 77938.3198
If we take 5328 away from 5460, we end up with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Step 13:
666 can be fit into 1320 1 times, resulting in a remainder of 654.
The number 1 becomes the next digit in our result. 
Result so far: 77938.31981
Subtract 666 from 1320 to get 654.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6540, and continue the process.

Going ahead to step 14:
6540 divided by 666 is 9 with a remainder of 546.
The next digit of our result is 9. 
Result so far: 77938.319819
Subtracting 5994 from 6540 leaves us with 546.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5460, and continue the process.

Step 15:
666 goes into 5460 8 times with a remainder of 132.
Use 8 as the next digit of our solution. 
Result so far: 77938.3198198
Subtracting 5328 from 5460 leaves us with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Let's proceed to step 16:
1320 divided by 666 is 1 with a remainder of 654.
Use 1 as the next digit of our solution. 
Result so far: 77938.31981981
Subtract 666 from 1320 to get 654.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6540, and continue the process.

The final result is 77938.31981981 with a remainder of 6.54e-07.