We're dividing 342378 by 80 
Let's see how many times 80 fits into 342378.

Advancing to step 1:
The number 80 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 80

Going ahead to step 2:
When dividing 34 by 80, we get 0 with a remainder of 34.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 34 after subtracting 0 from 34.
Grab the next digit (2) from the dividend, add it to 34, then carry on: 342 / 80

Going ahead to step 3:
80 can be fit into 342 4 times, resulting in a remainder of 22.
The next digit of our result is 4. 
Result so far: 4.0
If we subtract 320 from 342, we get 22.
Include the next digit (3) from the dividend after 22, then repeat: 223 / 80

Advancing to step 4:
When dividing 223 by 80, we get 2 with a remainder of 63.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
Subtract 160 from 223 to get 63.
Bring next digit (7) of the dividend behind the 63 and repeat the process: 637 / 80

Moving on to step 5:
The number 80 fits into 637 7 times, leaving a remainder of 77.
The number 7 becomes the next digit in our result. 
Result so far: 427.0
If we subtract 560 from 637, we get 77.
Take the next digit (8) from the dividend and append it to 77, then repeat: 778 / 80

On to step 6:
80 goes into 778 9 times with a remainder of 58.
The number 9 becomes the next digit in our result. 
Result so far: 4279.0
If we take 720 away from 778, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 7:
The number 80 fits into 580 7 times, leaving a remainder of 20.
The next digit of our result is 7. 
Result so far: 4279.7
If we take 560 away from 580, we end up 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.

Advancing to step 8:
The number 80 fits into 200 2 times, leaving a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 4279.72
Subtracting 160 from 200 leaves us 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:
When dividing 400 by 80, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 4279.725
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.

Advancing to step 10:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 4279.725
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:
If we divide 0 by 80, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 4279.725
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.

Our division results in 4279.725 with a remaining 0.0.