We look at the division of 66669309 by 84 
We want to divide 66669309 by 84.

On to step 1:
6 divided by 84 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 84

Step 2:
The number 84 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Bring next digit (6) of the dividend behind the 66 and repeat the process: 666 / 84

Advancing to step 3:
When dividing 666 by 84, we get 7 with a remainder of 78.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 588 from 666 leaves us with 78.
Include the next digit (6) from the dividend after 78, then repeat: 786 / 84

Step 4:
When dividing 786 by 84, we get 9 with a remainder of 30.
Write down 9 as next digit of the result. 
Result so far: 79.0
If we subtract 756 from 786, we get 30.
Include the next digit (9) from the dividend after 30, then repeat: 309 / 84

On to step 5:
309 divided by 84 is 3 with a remainder of 57.
Put 3 as the next digit of the answer. 
Result so far: 793.0
If we subtract 252 from 309, we get 57.
Fetch the next digit (3) from the dividend, attach it to 57 and continue: 573 / 84

Moving on to step 6:
When dividing 573 by 84, we get 6 with a remainder of 69.
Use 6 as the next digit of our solution. 
Result so far: 7936.0
If we subtract 504 from 573, we get 69.
Include the next digit (0) from the dividend after 69, then repeat: 690 / 84

Advancing to step 7:
84 goes into 690 8 times with a remainder of 18.
The number 8 becomes the next digit in our result. 
Result so far: 79368.0
Subtract 672 from 690 to get 18.
Bring next digit (9) of the dividend behind the 18 and repeat the process: 189 / 84

On to step 8:
84 can be fit into 189 2 times, resulting in a remainder of 21.
The number 2 becomes the next digit in our result. 
Result so far: 793682.0
Subtract 168 from 189 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 9:
The number 84 fits into 210 2 times, leaving a remainder of 42.
Write down 2 as next digit of the result. 
Result so far: 793682.2
If we take 168 away from 210, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 10:
84 goes into 420 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 793682.25
Subtract 420 from 420 to 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.

Going ahead to step 11:
The number 84 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 793682.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 12:
When dividing 0 by 84, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 793682.25
Subtract 0 from 0 to 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 793682.25, and the remainder is 0.0.