We look at the division of 43399315 by 45 
We're looking to find how many times 45 goes into 43399315.

Moving on to step 1:
45 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 45

Advancing to step 2:
45 goes into 43 0 times with a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Append the next digit (3) from the dividend to 43 and continue with: 433 / 45

Moving on to step 3:
45 goes into 433 9 times with a remainder of 28.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtract 405 from 433 to get 28.
Take the next digit (9) from the dividend and append it to 28, then repeat: 289 / 45

Advancing to step 4:
45 can be fit into 289 6 times, resulting in a remainder of 19.
The number 6 becomes the next digit in our result. 
Result so far: 96.0
If we subtract 270 from 289, we get 19.
Fetch the next digit (9) from the dividend, attach it to 19 and continue: 199 / 45

Going ahead to step 5:
The number 45 fits into 199 4 times, leaving a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 964.0
If we take 180 away from 199, we end up with 19.
Grab the next digit (3) from the dividend, add it to 19, then carry on: 193 / 45

On to step 6:
45 can be fit into 193 4 times, resulting in a remainder of 13.
The next digit of our result is 4. 
Result so far: 9644.0
Deduct 180 from 193 and we're left with 13.
Bring next digit (1) of the dividend behind the 13 and repeat the process: 131 / 45

On to step 7:
45 can be fit into 131 2 times, resulting in a remainder of 41.
Put 2 as the next digit of the answer. 
Result so far: 96442.0
The remainder is 41 after subtracting 90 from 131.
Bring next digit (5) of the dividend behind the 41 and repeat the process: 415 / 45

Moving on to step 8:
When dividing 415 by 45, we get 9 with a remainder of 10.
Use 9 as the next digit of our solution. 
Result so far: 964429.0
Subtract 405 from 415 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
100 divided by 45 is 2 with a remainder of 10.
The number 2 becomes the next digit in our result. 
Result so far: 964429.2
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 10:
The number 45 fits into 100 2 times, leaving a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 964429.22
Subtracting 90 from 100 leaves us 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.

The final outcome is 964429.22, with a leftover of 0.01.