399009 ÷ 67 
Our goal is to divide 399009 by 67.

Going ahead to step 1:
If we divide 3 by 67, we get 0 and a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 67

On to step 2:
The number 67 fits into 39 0 times, leaving a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Bring next digit (9) of the dividend behind the 39 and repeat the process: 399 / 67

Going ahead to step 3:
If we divide 399 by 67, we get 5 and a remainder of 64.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Deduct 335 from 399 and we're left with 64.
Fetch the next digit (0) from the dividend, attach it to 64 and continue: 640 / 67

Step 4:
640 divided by 67 is 9 with a remainder of 37.
The next digit of our result is 9. 
Result so far: 59.0
If we take 603 away from 640, we end up with 37.
Include the next digit (0) from the dividend after 37, then repeat: 370 / 67

Going ahead to step 5:
67 goes into 370 5 times with a remainder of 35.
Record the quotient 5 as the next digit in the result. 
Result so far: 595.0
If we subtract 335 from 370, we get 35.
Fetch the next digit (9) from the dividend, attach it to 35 and continue: 359 / 67

Step 6:
67 goes into 359 5 times with a remainder of 24.
The next digit of our result is 5. 
Result so far: 5955.0
If we take 335 away from 359, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 7:
When dividing 240 by 67, we get 3 with a remainder of 39.
The number 3 becomes the next digit in our result. 
Result so far: 5955.3
Subtract 201 from 240 to get 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 8:
67 can be fit into 390 5 times, resulting in a remainder of 55.
Put 5 as the next digit of the answer. 
Result so far: 5955.35
Deduct 335 from 390 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 9:
67 goes into 550 8 times with a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 5955.358
If we take 536 away from 550, we end up with 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 10:
When dividing 140 by 67, we get 2 with a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 5955.3582
If we take 134 away from 140, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 11:
When dividing 60 by 67, we get 0 with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 5955.3582
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 12:
When dividing 600 by 67, we get 8 with a remainder of 64.
Use 8 as the next digit of our solution. 
Result so far: 5955.358208
If we take 536 away from 600, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 13:
If we divide 640 by 67, we get 9 and a remainder of 37.
The next digit of our result is 9. 
Result so far: 5955.3582089
Subtract 603 from 640 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Advancing to step 14:
When dividing 370 by 67, we get 5 with a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 5955.35820895
The remainder is 35 after subtracting 335 from 370.
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 5955.35820895, with a leftover of 3.5e-08.