We look at the division of 43376803 by 321 
We're looking to find how many times 321 goes into 43376803.

On to step 1:
321 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 321

Moving on to step 2:
43 divided by 321 is 0 with a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 43 and we're left with 43.
Fetch the next digit (3) from the dividend, attach it to 43 and continue: 433 / 321

Moving on to step 3:
433 divided by 321 is 1 with a remainder of 112.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 112 after subtracting 321 from 433.
Fetch the next digit (7) from the dividend, attach it to 112 and continue: 1127 / 321

Going ahead to step 4:
321 goes into 1127 3 times with a remainder of 164.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
If we subtract 963 from 1127, we get 164.
Grab the next digit (6) from the dividend, add it to 164, then carry on: 1646 / 321

Let's proceed to step 5:
321 goes into 1646 5 times with a remainder of 41.
The next digit of our result is 5. 
Result so far: 135.0
If we take 1605 away from 1646, we end up with 41.
Grab the next digit (8) from the dividend, add it to 41, then carry on: 418 / 321

Moving on to step 6:
When dividing 418 by 321, we get 1 with a remainder of 97.
Write down 1 as next digit of the result. 
Result so far: 1351.0
Subtract 321 from 418 to get 97.
Fetch the next digit (0) from the dividend, attach it to 97 and continue: 970 / 321

Let's proceed to step 7:
321 goes into 970 3 times with a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 13513.0
Deduct 963 from 970 and we're left with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 321

Advancing to step 8:
321 goes into 73 0 times with a remainder of 73.
Record the quotient 0 as the next digit in the result. 
Result so far: 135130.0
Deduct 0 from 73 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 9:
When dividing 730 by 321, we get 2 with a remainder of 88.
Record the quotient 2 as the next digit in the result. 
Result so far: 135130.2
If we take 642 away from 730, we end up with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 10:
The number 321 fits into 880 2 times, leaving a remainder of 238.
The next digit of our result is 2. 
Result so far: 135130.22
Deduct 642 from 880 and we're left with 238.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2380, and continue the process.

After the division, we end up with 135130.22 and a remainder of 0.238.