840240 ÷ 43 
We're looking to find how many times 43 goes into 840240.

Step 1:
43 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 43

On to step 2:
If we divide 84 by 43, we get 1 and a remainder of 41.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 43 from 84 leaves us with 41.
Fetch the next digit (0) from the dividend, attach it to 41 and continue: 410 / 43

Going ahead to step 3:
410 divided by 43 is 9 with a remainder of 23.
Write down 9 as next digit of the result. 
Result so far: 19.0
Subtracting 387 from 410 leaves us with 23.
Bring next digit (2) of the dividend behind the 23 and repeat the process: 232 / 43

Advancing to step 4:
If we divide 232 by 43, we get 5 and a remainder of 17.
The next digit of our result is 5. 
Result so far: 195.0
Deduct 215 from 232 and we're left with 17.
Take the next digit (4) from the dividend and append it to 17, then repeat: 174 / 43

Moving on to step 5:
43 can be fit into 174 4 times, resulting in a remainder of 2.
The next digit of our result is 4. 
Result so far: 1954.0
If we take 172 away from 174, we end up with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 43

On to step 6:
43 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 19540.0
Subtracting 0 from 20 leaves us 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.

Let's proceed to step 7:
200 divided by 43 is 4 with a remainder of 28.
The number 4 becomes the next digit in our result. 
Result so far: 19540.4
The remainder is 28 after subtracting 172 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 8:
The number 43 fits into 280 6 times, leaving a remainder of 22.
Put 6 as the next digit of the answer. 
Result so far: 19540.46
If we subtract 258 from 280, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 9:
220 divided by 43 is 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 19540.465
The remainder is 5 after subtracting 215 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
The number 43 fits into 50 1 times, leaving a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 19540.4651
If we subtract 43 from 50, we get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 11:
The number 43 fits into 70 1 times, leaving a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 19540.46511
If we take 43 away from 70, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The final outcome is 19540.46511, with a leftover of 2.7e-05.