We look at the division of 51432399 by 666 
Our goal is to divide 51432399 by 666.

On to step 1:
666 can be fit into 5 0 times, resulting in 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.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 666

Advancing to step 2:
The number 666 fits into 51 0 times, leaving a remainder of 51.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 51 and we're left with 51.
Include the next digit (4) from the dividend after 51, then repeat: 514 / 666

On to step 3:
If we divide 514 by 666, we get 0 and a remainder of 514.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 514 leaves us with 514.
Grab the next digit (3) from the dividend, add it to 514, then carry on: 5143 / 666

Let's proceed to step 4:
The number 666 fits into 5143 7 times, leaving a remainder of 481.
The next digit of our result is 7. 
Result so far: 7.0
If we subtract 4662 from 5143, we get 481.
Fetch the next digit (2) from the dividend, attach it to 481 and continue: 4812 / 666

Moving on to step 5:
If we divide 4812 by 666, we get 7 and a remainder of 150.
Write down 7 as next digit of the result. 
Result so far: 77.0
If we take 4662 away from 4812, we end up with 150.
Append the next digit (3) from the dividend to 150 and continue with: 1503 / 666

Let's proceed to step 6:
1503 divided by 666 is 2 with a remainder of 171.
The next digit of our result is 2. 
Result so far: 772.0
If we subtract 1332 from 1503, we get 171.
Grab the next digit (9) from the dividend, add it to 171, then carry on: 1719 / 666

Step 7:
When dividing 1719 by 666, we get 2 with a remainder of 387.
Record the quotient 2 as the next digit in the result. 
Result so far: 7722.0
Deduct 1332 from 1719 and we're left with 387.
Grab the next digit (9) from the dividend, add it to 387, then carry on: 3879 / 666

Let's proceed to step 8:
The number 666 fits into 3879 5 times, leaving a remainder of 549.
Use 5 as the next digit of our solution. 
Result so far: 77225.0
Deduct 3330 from 3879 and we're left with 549.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5490, and continue the process.

Going ahead to step 9:
When dividing 5490 by 666, we get 8 with a remainder of 162.
The next digit of our result is 8. 
Result so far: 77225.8
Subtracting 5328 from 5490 leaves us with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

On to step 10:
The number 666 fits into 1620 2 times, leaving a remainder of 288.
Put 2 as the next digit of the answer. 
Result so far: 77225.82
If we subtract 1332 from 1620, we get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Step 11:
When dividing 2880 by 666, we get 4 with a remainder of 216.
Write down 4 as next digit of the result. 
Result so far: 77225.824
If we take 2664 away from 2880, we end up with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Going ahead to step 12:
666 goes into 2160 3 times with a remainder of 162.
Use 3 as the next digit of our solution. 
Result so far: 77225.8243
Deduct 1998 from 2160 and we're left with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Step 13:
666 goes into 1620 2 times with a remainder of 288.
Use 2 as the next digit of our solution. 
Result so far: 77225.82432
If we take 1332 away from 1620, we end up with 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

Advancing to step 14:
When dividing 2880 by 666, we get 4 with a remainder of 216.
Record the quotient 4 as the next digit in the result. 
Result so far: 77225.824324
Deduct 2664 from 2880 and we're left with 216.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Step 15:
666 goes into 2160 3 times with a remainder of 162.
Put 3 as the next digit of the answer. 
Result so far: 77225.8243243
If we subtract 1998 from 2160, we get 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Let's proceed to step 16:
666 can be fit into 1620 2 times, resulting in a remainder of 288.
Record the quotient 2 as the next digit in the result. 
Result so far: 77225.82432432
If we subtract 1332 from 1620, we get 288.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2880, and continue the process.

The final result is 77225.82432432 with a remainder of 2.88e-07.