399509 ÷ 73 
We want to figure out the number of times 399509 can be divided by 73.

Going ahead to step 1:
The number 73 fits into 3 0 times, leaving a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 73

Advancing to step 2:
If we divide 39 by 73, we get 0 and a remainder of 39.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Take the next digit (9) from the dividend and append it to 39, then repeat: 399 / 73

Step 3:
If we divide 399 by 73, we get 5 and a remainder of 34.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
The remainder is 34 after subtracting 365 from 399.
Take the next digit (5) from the dividend and append it to 34, then repeat: 345 / 73

Step 4:
73 goes into 345 4 times with a remainder of 53.
Put 4 as the next digit of the answer. 
Result so far: 54.0
If we subtract 292 from 345, we get 53.
Grab the next digit (0) from the dividend, add it to 53, then carry on: 530 / 73

Moving on to step 5:
73 can be fit into 530 7 times, resulting in a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 547.0
If we subtract 511 from 530, we get 19.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 73

Going ahead to step 6:
199 divided by 73 is 2 with a remainder of 53.
The next digit of our result is 2. 
Result so far: 5472.0
Subtract 146 from 199 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 7:
If we divide 530 by 73, we get 7 and a remainder of 19.
The number 7 becomes the next digit in our result. 
Result so far: 5472.7
If we subtract 511 from 530, we get 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 8:
The number 73 fits into 190 2 times, leaving a remainder of 44.
Put 2 as the next digit of the answer. 
Result so far: 5472.72
Subtracting 146 from 190 leaves us with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 9:
73 goes into 440 6 times with a remainder of 2.
The next digit of our result is 6. 
Result so far: 5472.726
Subtracting 438 from 440 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 10:
73 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 5472.726
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 11:
73 can be fit into 200 2 times, resulting in a remainder of 54.
The next digit of our result is 2. 
Result so far: 5472.72602
Subtracting 146 from 200 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Let's proceed to step 12:
The number 73 fits into 540 7 times, leaving a remainder of 29.
Use 7 as the next digit of our solution. 
Result so far: 5472.726027
The remainder is 29 after subtracting 511 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 13:
290 divided by 73 is 3 with a remainder of 71.
The number 3 becomes the next digit in our result. 
Result so far: 5472.7260273
If we subtract 219 from 290, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 14:
If we divide 710 by 73, we get 9 and a remainder of 53.
Write down 9 as next digit of the result. 
Result so far: 5472.72602739
If we take 657 away from 710, we end up with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

The final outcome is 5472.72602739, with a leftover of 5.3e-08.