421023 ÷ 80 
We want to figure out the number of times 421023 can be divided by 80.

Going ahead to step 1:
The number 80 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 80

Step 2:
The number 80 fits into 42 0 times, leaving a remainder of 42.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 42 after subtracting 0 from 42.
Append the next digit (1) from the dividend to 42 and continue with: 421 / 80

Step 3:
When dividing 421 by 80, we get 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.
Take the next digit (0) from the dividend and append it to 21, then repeat: 210 / 80

Let's proceed to step 4:
The number 80 fits into 210 2 times, leaving a remainder of 50.
Record the quotient 2 as the next digit in the result. 
Result so far: 52.0
Deduct 160 from 210 and we're left with 50.
Take the next digit (2) from the dividend and append it to 50, then repeat: 502 / 80

Advancing to step 5:
The number 80 fits into 502 6 times, leaving a remainder of 22.
Put 6 as the next digit of the answer. 
Result so far: 526.0
If we subtract 480 from 502, we get 22.
Fetch the next digit (3) from the dividend, attach it to 22 and continue: 223 / 80

Advancing to step 6:
The number 80 fits into 223 2 times, leaving a remainder of 63.
The next digit of our result is 2. 
Result so far: 5262.0
Subtract 160 from 223 to get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Moving on to step 7:
80 goes into 630 7 times with a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 5262.7
If we take 560 away from 630, we end up with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 8:
700 divided by 80 is 8 with a remainder of 60.
Put 8 as the next digit of the answer. 
Result so far: 5262.78
Deduct 640 from 700 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.

Moving on to step 9:
80 can be fit into 600 7 times, resulting in a remainder of 40.
Write down 7 as next digit of the result. 
Result so far: 5262.787
Subtract 560 from 600 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.

Advancing to step 10:
If we divide 400 by 80, we get 5 and a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 5262.7875
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.

On to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 5262.7875
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.

Step 12:
If we divide 0 by 80, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 5262.7875
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.

After the division, we end up with 5262.7875 and a remainder of 0.0.