743721 ÷ 80 
We want to divide 743721 by 80.

Going ahead to step 1:
80 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 80

On to step 2:
When dividing 74 by 80, we get 0 with a remainder of 74.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 74 leaves us with 74.
Take the next digit (3) from the dividend and append it to 74, then repeat: 743 / 80

Step 3:
80 can be fit into 743 9 times, resulting in a remainder of 23.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtracting 720 from 743 leaves us with 23.
Take the next digit (7) from the dividend and append it to 23, then repeat: 237 / 80

Advancing to step 4:
The number 80 fits into 237 2 times, leaving a remainder of 77.
The next digit of our result is 2. 
Result so far: 92.0
If we subtract 160 from 237, we get 77.
Take the next digit (2) from the dividend and append it to 77, then repeat: 772 / 80

Step 5:
80 can be fit into 772 9 times, resulting in a remainder of 52.
Write down 9 as next digit of the result. 
Result so far: 929.0
Deduct 720 from 772 and we're left with 52.
Include the next digit (1) from the dividend after 52, then repeat: 521 / 80

Moving on to step 6:
When dividing 521 by 80, we get 6 with a remainder of 41.
The number 6 becomes the next digit in our result. 
Result so far: 9296.0
The remainder is 41 after subtracting 480 from 521.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 7:
The number 80 fits into 410 5 times, leaving a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 9296.5
If we subtract 400 from 410, 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.

On to step 8:
100 divided by 80 is 1 with a remainder of 20.
The number 1 becomes the next digit in our result. 
Result so far: 9296.51
Subtracting 80 from 100 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
200 divided by 80 is 2 with a remainder of 40.
The next digit of our result is 2. 
Result so far: 9296.512
Deduct 160 from 200 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.

Going ahead to step 10:
80 goes into 400 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 9296.5125
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.

Going ahead to step 11:
0 divided by 80 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 9296.5125
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.

Step 12:
80 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9296.5125
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 9296.5125 and a remainder of 0.0.