343974 divided by 80 
We want to figure out the number of times 343974 can be divided by 80.

Step 1:
3 divided by 80 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 80

On to step 2:
80 can be fit into 34 0 times, resulting in a remainder of 34.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 34 to get 34.
Include the next digit (3) from the dividend after 34, then repeat: 343 / 80

Moving on to step 3:
The number 80 fits into 343 4 times, leaving a remainder of 23.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 23 after subtracting 320 from 343.
Grab the next digit (9) from the dividend, add it to 23, then carry on: 239 / 80

On to step 4:
80 goes into 239 2 times with a remainder of 79.
Use 2 as the next digit of our solution. 
Result so far: 42.0
Deduct 160 from 239 and we're left with 79.
Include the next digit (7) from the dividend after 79, then repeat: 797 / 80

Moving on to step 5:
When dividing 797 by 80, we get 9 with a remainder of 77.
The number 9 becomes the next digit in our result. 
Result so far: 429.0
Deduct 720 from 797 and we're left with 77.
Take the next digit (4) from the dividend and append it to 77, then repeat: 774 / 80

Let's proceed to step 6:
The number 80 fits into 774 9 times, leaving a remainder of 54.
Record the quotient 9 as the next digit in the result. 
Result so far: 4299.0
If we take 720 away from 774, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 7:
If we divide 540 by 80, we get 6 and a remainder of 60.
The next digit of our result is 6. 
Result so far: 4299.6
Deduct 480 from 540 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.

Step 8:
600 divided by 80 is 7 with a remainder of 40.
Use 7 as the next digit of our solution. 
Result so far: 4299.67
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.

Going ahead to step 9:
The number 80 fits into 400 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 4299.675
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.

On to step 10:
80 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4299.675
Subtract 0 from 0 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.

On to step 11:
0 divided by 80 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 4299.675
Subtracting 0 from 0 leaves us 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 4299.675 and a remainder of 0.0.