We look at the division of 343980 by 91 
Our goal is to divide 343980 by 91.

Step 1:
91 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Grab the next digit (4) from the dividend, add it to 3, then carry on: 34 / 91

Going ahead to step 2:
If we divide 34 by 91, we get 0 and a remainder of 34.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 34, we get 34.
Include the next digit (3) from the dividend after 34, then repeat: 343 / 91

Moving on to step 3:
If we divide 343 by 91, we get 3 and a remainder of 70.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 273 from 343 to get 70.
Fetch the next digit (9) from the dividend, attach it to 70 and continue: 709 / 91

Moving on to step 4:
When dividing 709 by 91, we get 7 with a remainder of 72.
Use 7 as the next digit of our solution. 
Result so far: 37.0
Deduct 637 from 709 and we're left with 72.
Grab the next digit (8) from the dividend, add it to 72, then carry on: 728 / 91

Step 5:
If we divide 728 by 91, we get 8 and a remainder of 0.
The next digit of our result is 8. 
Result so far: 378.0
The remainder is 0 after subtracting 728 from 728.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 91

On to step 6:
When dividing 0 by 91, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3780.0
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.

Going ahead to step 7:
91 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 3780.0
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.

Going ahead to step 8:
91 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 3780.0
Deduct 0 from 0 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.

After the division, we end up with 3780.0 and a remainder of 0.0.