We look at the division of 423537 by 80 
We're looking to find how many times 80 goes into 423537.

Advancing to step 1:
When dividing 4 by 80, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 80

Moving on to step 2:
42 divided by 80 is 0 with a remainder of 42.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 42, we end up with 42.
Take the next digit (3) from the dividend and append it to 42, then repeat: 423 / 80

Moving on to step 3:
423 divided by 80 is 5 with a remainder of 23.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 400 from 423 and we're left with 23.
Take the next digit (5) from the dividend and append it to 23, then repeat: 235 / 80

Moving on to step 4:
80 goes into 235 2 times with a remainder of 75.
The number 2 becomes the next digit in our result. 
Result so far: 52.0
If we subtract 160 from 235, we get 75.
Grab the next digit (3) from the dividend, add it to 75, then carry on: 753 / 80

Going ahead to step 5:
753 divided by 80 is 9 with a remainder of 33.
Use 9 as the next digit of our solution. 
Result so far: 529.0
Deduct 720 from 753 and we're left with 33.
Append the next digit (7) from the dividend to 33 and continue with: 337 / 80

Moving on to step 6:
The number 80 fits into 337 4 times, leaving a remainder of 17.
The number 4 becomes the next digit in our result. 
Result so far: 5294.0
Deduct 320 from 337 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 7:
When dividing 170 by 80, we get 2 with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 5294.2
If we subtract 160 from 170, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
80 goes into 100 1 times with a remainder of 20.
Put 1 as the next digit of the answer. 
Result so far: 5294.21
The remainder is 20 after subtracting 80 from 100.
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:
The number 80 fits into 200 2 times, leaving a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 5294.212
If we subtract 160 from 200, 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.

On to step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 5294.2125
If we subtract 400 from 400, we 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.

Let's proceed to step 11:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 5294.2125
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.

Going ahead to step 12:
0 divided by 80 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 5294.2125
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.

The final result is 5294.2125 with a remainder of 0.0.