We look at the division of 645900 by 43 
We want to divide 645900 by 43.

Step 1:
43 can be fit into 6 0 times, resulting in a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 43

Moving on to step 2:
43 goes into 64 1 times with a remainder of 21.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 43 from 64 and we're left with 21.
Take the next digit (5) from the dividend and append it to 21, then repeat: 215 / 43

Advancing to step 3:
When dividing 215 by 43, we get 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtracting 215 from 215 leaves us with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 43

Going ahead to step 4:
When dividing 9 by 43, we get 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 150.0
If we take 0 away from 9, we end up with 9.
Include the next digit (0) from the dividend after 9, then repeat: 90 / 43

Moving on to step 5:
43 can be fit into 90 2 times, resulting in a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 1502.0
Subtract 86 from 90 to get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 43

Going ahead to step 6:
40 divided by 43 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 15020.0
If we take 0 away from 40, we end up 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.

Advancing to step 7:
When dividing 400 by 43, we get 9 with a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 15020.9
The remainder is 13 after subtracting 387 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 8:
When dividing 130 by 43, we get 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 15020.93
Subtract 129 from 130 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
If we divide 10 by 43, we get 0 and a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 15020.93
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
The number 43 fits into 100 2 times, leaving a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 15020.9302
Subtract 86 from 100 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 11:
The number 43 fits into 140 3 times, leaving a remainder of 11.
The number 3 becomes the next digit in our result. 
Result so far: 15020.93023
If we take 129 away from 140, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 12:
43 can be fit into 110 2 times, resulting in a remainder of 24.
The number 2 becomes the next digit in our result. 
Result so far: 15020.930232
If we subtract 86 from 110, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 13:
If we divide 240 by 43, we get 5 and a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 15020.9302325
Subtract 215 from 240 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 14:
The number 43 fits into 250 5 times, leaving a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 15020.93023255
Deduct 215 from 250 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final outcome is 15020.93023255, with a leftover of 3.5e-08.