We look at the division of 666980 by 66 
We're looking to find how many times 66 goes into 666980.

Moving on to step 1:
66 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 66

Going ahead to step 2:
66 goes into 66 1 times with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 0 after subtracting 66 from 66.
Bring next digit (6) of the dividend behind the 0 and repeat the process: 6 / 66

Going ahead to step 3:
66 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 10.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 66

Let's proceed to step 4:
The number 66 fits into 69 1 times, leaving a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 101.0
Deduct 66 from 69 and we're left with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 66

Advancing to step 5:
When dividing 38 by 66, we get 0 with a remainder of 38.
The number 0 becomes the next digit in our result. 
Result so far: 1010.0
Deduct 0 from 38 and we're left with 38.
Take the next digit (0) from the dividend and append it to 38, then repeat: 380 / 66

On to step 6:
66 goes into 380 5 times with a remainder of 50.
Put 5 as the next digit of the answer. 
Result so far: 10105.0
If we take 330 away from 380, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Moving on to step 7:
When dividing 500 by 66, we get 7 with a remainder of 38.
Record the quotient 7 as the next digit in the result. 
Result so far: 10105.7
Deduct 462 from 500 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 8:
When dividing 380 by 66, we get 5 with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 10105.75
Deduct 330 from 380 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 9:
The number 66 fits into 500 7 times, leaving a remainder of 38.
Use 7 as the next digit of our solution. 
Result so far: 10105.757
Subtracting 462 from 500 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 10:
When dividing 380 by 66, we get 5 with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 10105.7575
Subtracting 330 from 380 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 11:
When dividing 500 by 66, we get 7 with a remainder of 38.
Write down 7 as next digit of the result. 
Result so far: 10105.75757
Subtracting 462 from 500 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Step 12:
The number 66 fits into 380 5 times, leaving a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 10105.757575
The remainder is 50 after subtracting 330 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 13:
When dividing 500 by 66, we get 7 with a remainder of 38.
The number 7 becomes the next digit in our result. 
Result so far: 10105.7575757
Subtracting 462 from 500 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 14:
66 goes into 380 5 times with a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 10105.75757575
Subtracting 330 from 380 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final outcome is 10105.75757575, with a leftover of 5e-08.