We divide 421669 by 80
Let's see how many times 80 fits into 421669.

Advancing to step 1:
If we divide 4 by 80, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 80

Going ahead to step 2:
42 divided by 80 is 0 with a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Take the next digit (1) from the dividend and append it to 42, then repeat: 421 / 80

Let's proceed to step 3:
421 divided by 80 is 5 with a remainder of 21.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Deduct 400 from 421 and we're left with 21.
Bring next digit (6) of the dividend behind the 21 and repeat the process: 216 / 80

Moving on to step 4:
The number 80 fits into 216 2 times, leaving a remainder of 56.
Use 2 as the next digit of our solution. 
Result so far: 52.0
If we subtract 160 from 216, we get 56.
Take the next digit (6) from the dividend and append it to 56, then repeat: 566 / 80

Let's proceed to step 5:
80 can be fit into 566 7 times, resulting in a remainder of 6.
The next digit of our result is 7. 
Result so far: 527.0
Deduct 560 from 566 and we're left with 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 80

Let's proceed to step 6:
80 goes into 69 0 times with a remainder of 69.
Use 0 as the next digit of our solution. 
Result so far: 5270.0
If we subtract 0 from 69, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 7:
690 divided by 80 is 8 with a remainder of 50.
Record the quotient 8 as the next digit in the result. 
Result so far: 5270.8
Subtract 640 from 690 to get 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 8:
80 can be fit into 500 6 times, resulting in a remainder of 20.
Record the quotient 6 as the next digit in the result. 
Result so far: 5270.86
Subtract 480 from 500 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
200 divided by 80 is 2 with a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 5270.862
Subtract 160 from 200 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 5270.8625
The remainder is 0 after subtracting 400 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 11:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5270.8625
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.

Going ahead to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 5270.8625
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.

The final result is 5270.8625 with a remainder of 0.0.