We divide 421820 by 80
We're looking to find how many times 80 goes into 421820.

Moving on to step 1:
4 divided by 80 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 80

Let's proceed to step 2:
If we divide 42 by 80, we get 0 and a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Grab the next digit (1) from the dividend, add it to 42, then carry on: 421 / 80

Let's proceed to step 3:
80 can be fit into 421 5 times, resulting in a remainder of 21.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtract 400 from 421 to get 21.
Append the next digit (8) from the dividend to 21 and continue with: 218 / 80

Going ahead to step 4:
80 can be fit into 218 2 times, resulting in a remainder of 58.
Put 2 as the next digit of the answer. 
Result so far: 52.0
Subtracting 160 from 218 leaves us with 58.
Append the next digit (2) from the dividend to 58 and continue with: 582 / 80

Step 5:
The number 80 fits into 582 7 times, leaving a remainder of 22.
Record the quotient 7 as the next digit in the result. 
Result so far: 527.0
Deduct 560 from 582 and we're left with 22.
Append the next digit (0) from the dividend to 22 and continue with: 220 / 80

Step 6:
When dividing 220 by 80, we get 2 with a remainder of 60.
Write down 2 as next digit of the result. 
Result so far: 5272.0
Deduct 160 from 220 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 7:
80 can be fit into 600 7 times, resulting in a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 5272.7
If we subtract 560 from 600, we 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.

Advancing to step 8:
80 can be fit into 400 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 5272.75
If we take 400 away from 400, we end up 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.

Advancing to step 9:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 5272.75
If we take 0 away from 0, we end up 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.

On to step 10:
80 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 5272.75
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.

In conclusion, the division gives 5272.75 with a balance of 0.0.