We're dividing 351749 by 80 
We want to divide 351749 by 80.

Step 1:
If we divide 3 by 80, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 80

On to step 2:
80 can be fit into 35 0 times, resulting in a remainder of 35.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 35 and we're left with 35.
Fetch the next digit (1) from the dividend, attach it to 35 and continue: 351 / 80

On to step 3:
When dividing 351 by 80, we get 4 with a remainder of 31.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
The remainder is 31 after subtracting 320 from 351.
Fetch the next digit (7) from the dividend, attach it to 31 and continue: 317 / 80

Going ahead to step 4:
If we divide 317 by 80, we get 3 and a remainder of 77.
The number 3 becomes the next digit in our result. 
Result so far: 43.0
Deduct 240 from 317 and we're left with 77.
Bring next digit (4) of the dividend behind the 77 and repeat the process: 774 / 80

Let's proceed to step 5:
80 goes into 774 9 times with a remainder of 54.
The number 9 becomes the next digit in our result. 
Result so far: 439.0
Subtract 720 from 774 to get 54.
Append the next digit (9) from the dividend to 54 and continue with: 549 / 80

Advancing to step 6:
The number 80 fits into 549 6 times, leaving a remainder of 69.
Use 6 as the next digit of our solution. 
Result so far: 4396.0
If we take 480 away from 549, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Step 7:
80 can be fit into 690 8 times, resulting in a remainder of 50.
Use 8 as the next digit of our solution. 
Result so far: 4396.8
If we subtract 640 from 690, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
When dividing 500 by 80, we get 6 with a remainder of 20.
The next digit of our result is 6. 
Result so far: 4396.86
The remainder is 20 after subtracting 480 from 500.
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:
80 can be fit into 200 2 times, resulting in a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 4396.862
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.

On to step 10:
400 divided by 80 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 4396.8625
Subtracting 400 from 400 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.

On to step 11:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 4396.8625
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.

Let's proceed to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 4396.8625
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.

The final outcome is 4396.8625, with a leftover of 0.0.