19991 divided by 43 
We're looking to find how many times 43 goes into 19991.

On to step 1:
43 can be fit into 1 0 times, resulting in a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 43

Moving on to step 2:
19 divided by 43 is 0 with a remainder of 19.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 19 after subtracting 0 from 19.
Grab the next digit (9) from the dividend, add it to 19, then carry on: 199 / 43

Going ahead to step 3:
199 divided by 43 is 4 with a remainder of 27.
The next digit of our result is 4. 
Result so far: 4.0
If we take 172 away from 199, we end up with 27.
Grab the next digit (9) from the dividend, add it to 27, then carry on: 279 / 43

Let's proceed to step 4:
279 divided by 43 is 6 with a remainder of 21.
Write down 6 as next digit of the result. 
Result so far: 46.0
Subtracting 258 from 279 leaves us with 21.
Fetch the next digit (1) from the dividend, attach it to 21 and continue: 211 / 43

Advancing to step 5:
When dividing 211 by 43, we get 4 with a remainder of 39.
Record the quotient 4 as the next digit in the result. 
Result so far: 464.0
If we take 172 away from 211, we end up with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

On to step 6:
When dividing 390 by 43, we get 9 with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 464.9
If we take 387 away from 390, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
If we divide 30 by 43, we get 0 and a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 464.9
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 8:
The number 43 fits into 300 6 times, leaving a remainder of 42.
The number 6 becomes the next digit in our result. 
Result so far: 464.906
The remainder is 42 after subtracting 258 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 9:
43 goes into 420 9 times with a remainder of 33.
The next digit of our result is 9. 
Result so far: 464.9069
If we take 387 away from 420, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 10:
330 divided by 43 is 7 with a remainder of 29.
Record the quotient 7 as the next digit in the result. 
Result so far: 464.90697
Subtract 301 from 330 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 11:
290 divided by 43 is 6 with a remainder of 32.
The number 6 becomes the next digit in our result. 
Result so far: 464.906976
If we subtract 258 from 290, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 12:
320 divided by 43 is 7 with a remainder of 19.
Put 7 as the next digit of the answer. 
Result so far: 464.9069767
If we take 301 away from 320, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 13:
43 goes into 190 4 times with a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 464.90697674
Subtracting 172 from 190 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

After the division, we end up with 464.90697674 and a remainder of 1.8e-08.