43419443 ÷ 80 
We want to figure out the number of times 43419443 can be divided by 80.

Moving on to step 1:
4 divided by 80 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 80

Going ahead to step 2:
When dividing 43 by 80, we get 0 with a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 43 after subtracting 0 from 43.
Append the next digit (4) from the dividend to 43 and continue with: 434 / 80

On to step 3:
80 goes into 434 5 times with a remainder of 34.
Put 5 as the next digit of the answer. 
Result so far: 5.0
Subtract 400 from 434 to get 34.
Append the next digit (1) from the dividend to 34 and continue with: 341 / 80

Moving on to step 4:
80 can be fit into 341 4 times, resulting in a remainder of 21.
Use 4 as the next digit of our solution. 
Result so far: 54.0
The remainder is 21 after subtracting 320 from 341.
Append the next digit (9) from the dividend to 21 and continue with: 219 / 80

Going ahead to step 5:
80 can be fit into 219 2 times, resulting in a remainder of 59.
The next digit of our result is 2. 
Result so far: 542.0
The remainder is 59 after subtracting 160 from 219.
Include the next digit (4) from the dividend after 59, then repeat: 594 / 80

Step 6:
If we divide 594 by 80, we get 7 and a remainder of 34.
Put 7 as the next digit of the answer. 
Result so far: 5427.0
If we take 560 away from 594, we end up with 34.
Include the next digit (4) from the dividend after 34, then repeat: 344 / 80

Moving on to step 7:
The number 80 fits into 344 4 times, leaving a remainder of 24.
The number 4 becomes the next digit in our result. 
Result so far: 54274.0
If we subtract 320 from 344, we get 24.
Bring next digit (3) of the dividend behind the 24 and repeat the process: 243 / 80

Moving on to step 8:
The number 80 fits into 243 3 times, leaving a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 542743.0
Deduct 240 from 243 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
80 goes into 30 0 times with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 542743.0
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 10:
When dividing 300 by 80, we get 3 with a remainder of 60.
The number 3 becomes the next digit in our result. 
Result so far: 542743.03
The remainder is 60 after subtracting 240 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 11:
The number 80 fits into 600 7 times, leaving a remainder of 40.
Write down 7 as next digit of the result. 
Result so far: 542743.037
Deduct 560 from 600 and we're left with 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 12:
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: 542743.0375
Deduct 400 from 400 and we're left 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 13:
If we divide 0 by 80, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 542743.0375
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.

On to step 14:
0 divided by 80 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 542743.0375
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.

The final result is 542743.0375 with a remainder of 0.0.