We look at the division of 666129 by 8 
Let's see how many times 8 fits into 666129.

Step 1:
8 goes into 6 0 times with 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.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 8

Let's proceed to step 2:
The number 8 fits into 66 8 times, leaving a remainder of 2.
The next digit of our result is 8. 
Result so far: 8.0
If we subtract 64 from 66, we get 2.
Include the next digit (6) from the dividend after 2, then repeat: 26 / 8

Advancing to step 3:
When dividing 26 by 8, we get 3 with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 83.0
If we take 24 away from 26, we end up with 2.
Include the next digit (1) from the dividend after 2, then repeat: 21 / 8

On to step 4:
8 can be fit into 21 2 times, resulting in a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 832.0
Subtract 16 from 21 to get 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 8

Step 5:
8 can be fit into 52 6 times, resulting in a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 8326.0
If we subtract 48 from 52, we get 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 8

Advancing to step 6:
49 divided by 8 is 6 with a remainder of 1.
Use 6 as the next digit of our solution. 
Result so far: 83266.0
Subtracting 48 from 49 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
If we divide 10 by 8, we get 1 and a remainder of 2.
The next digit of our result is 1. 
Result so far: 83266.1
Deduct 8 from 10 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
8 goes into 20 2 times with a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 83266.12
The remainder is 4 after subtracting 16 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
When dividing 40 by 8, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 83266.125
If we subtract 40 from 40, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 10:
When dividing 0 by 8, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 83266.125
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 11:
When dividing 0 by 8, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 83266.125
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 83266.125, and the remainder is 0.0.