We look at the division of 123459 by 80 
We want to figure out the number of times 123459 can be divided by 80.

Moving on to step 1:
When dividing 1 by 80, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 80

Going ahead to step 2:
When dividing 12 by 80, we get 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 12, we end up with 12.
Take the next digit (3) from the dividend and append it to 12, then repeat: 123 / 80

Let's proceed to step 3:
When dividing 123 by 80, we get 1 with a remainder of 43.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 80 from 123 leaves us with 43.
Append the next digit (4) from the dividend to 43 and continue with: 434 / 80

Moving on to step 4:
If we divide 434 by 80, we get 5 and a remainder of 34.
Use 5 as the next digit of our solution. 
Result so far: 15.0
If we take 400 away from 434, we end up with 34.
Take the next digit (5) from the dividend and append it to 34, then repeat: 345 / 80

Step 5:
When dividing 345 by 80, we get 4 with a remainder of 25.
Put 4 as the next digit of the answer. 
Result so far: 154.0
The remainder is 25 after subtracting 320 from 345.
Grab the next digit (9) from the dividend, add it to 25, then carry on: 259 / 80

Advancing to step 6:
259 divided by 80 is 3 with a remainder of 19.
The number 3 becomes the next digit in our result. 
Result so far: 1543.0
Subtract 240 from 259 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Advancing to step 7:
When dividing 190 by 80, we get 2 with a remainder of 30.
Put 2 as the next digit of the answer. 
Result so far: 1543.2
Subtracting 160 from 190 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
80 can be fit into 300 3 times, resulting in a remainder of 60.
Write down 3 as next digit of the result. 
Result so far: 1543.23
Subtract 240 from 300 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 9:
If we divide 600 by 80, we get 7 and a remainder of 40.
The next digit of our result is 7. 
Result so far: 1543.237
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.

On to step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 1543.2375
Subtract 400 from 400 to 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.

Step 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1543.2375
If we subtract 0 from 0, 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 12:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 1543.2375
The remainder is 0 after subtracting 0 from 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 outcome is 1543.2375, with a leftover of 0.0.