We divide 669484 by 80
We want to figure out the number of times 669484 can be divided by 80.

On to step 1:
80 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (6) of the dividend behind the 6 and repeat the process: 66 / 80

Step 2:
80 can be fit into 66 0 times, resulting in a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (9) from the dividend after 66, then repeat: 669 / 80

Moving on to step 3:
When dividing 669 by 80, we get 8 with a remainder of 29.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 640 from 669 to get 29.
Append the next digit (4) from the dividend to 29 and continue with: 294 / 80

Going ahead to step 4:
The number 80 fits into 294 3 times, leaving a remainder of 54.
Use 3 as the next digit of our solution. 
Result so far: 83.0
Deduct 240 from 294 and we're left with 54.
Grab the next digit (8) from the dividend, add it to 54, then carry on: 548 / 80

Step 5:
548 divided by 80 is 6 with a remainder of 68.
Record the quotient 6 as the next digit in the result. 
Result so far: 836.0
Subtracting 480 from 548 leaves us with 68.
Bring next digit (4) of the dividend behind the 68 and repeat the process: 684 / 80

Advancing to step 6:
When dividing 684 by 80, we get 8 with a remainder of 44.
Put 8 as the next digit of the answer. 
Result so far: 8368.0
Deduct 640 from 684 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 7:
The number 80 fits into 440 5 times, leaving a remainder of 40.
The next digit of our result is 5. 
Result so far: 8368.5
Subtracting 400 from 440 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 8:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 8368.55
Deduct 400 from 400 and we're left 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.

After the division, we end up with 8368.55 and a remainder of 0.0.