We divide 399288 by 75
We want to figure out the number of times 399288 can be divided by 75.

Advancing to step 1:
The number 75 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 75

Moving on to step 2:
If we divide 39 by 75, we get 0 and a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Include the next digit (9) from the dividend after 39, then repeat: 399 / 75

Going ahead to step 3:
The number 75 fits into 399 5 times, leaving a remainder of 24.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 375 from 399 and we're left with 24.
Take the next digit (2) from the dividend and append it to 24, then repeat: 242 / 75

On to step 4:
When dividing 242 by 75, we get 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 53.0
The remainder is 17 after subtracting 225 from 242.
Include the next digit (8) from the dividend after 17, then repeat: 178 / 75

Step 5:
178 divided by 75 is 2 with a remainder of 28.
Put 2 as the next digit of the answer. 
Result so far: 532.0
If we take 150 away from 178, we end up with 28.
Fetch the next digit (8) from the dividend, attach it to 28 and continue: 288 / 75

Moving on to step 6:
75 can be fit into 288 3 times, resulting in a remainder of 63.
Use 3 as the next digit of our solution. 
Result so far: 5323.0
Subtracting 225 from 288 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 7:
630 divided by 75 is 8 with a remainder of 30.
Record the quotient 8 as the next digit in the result. 
Result so far: 5323.8
Deduct 600 from 630 and we're left 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:
When dividing 300 by 75, we get 4 with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 5323.84
Deduct 300 from 300 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
0 divided by 75 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 5323.84
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
When dividing 0 by 75, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 5323.84
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 5323.84, with a leftover of 0.0.