399584 divided by 64 
We're looking to find how many times 64 goes into 399584.

Going ahead to step 1:
3 divided by 64 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 64

Let's proceed to step 2:
If we divide 39 by 64, we get 0 and a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 39, we get 39.
Grab the next digit (9) from the dividend, add it to 39, then carry on: 399 / 64

Moving on to step 3:
64 goes into 399 6 times with a remainder of 15.
Write down 6 as next digit of the result. 
Result so far: 6.0
The remainder is 15 after subtracting 384 from 399.
Fetch the next digit (5) from the dividend, attach it to 15 and continue: 155 / 64

Moving on to step 4:
155 divided by 64 is 2 with a remainder of 27.
The number 2 becomes the next digit in our result. 
Result so far: 62.0
If we take 128 away from 155, we end up with 27.
Grab the next digit (8) from the dividend, add it to 27, then carry on: 278 / 64

Going ahead to step 5:
64 can be fit into 278 4 times, resulting in a remainder of 22.
The number 4 becomes the next digit in our result. 
Result so far: 624.0
The remainder is 22 after subtracting 256 from 278.
Fetch the next digit (4) from the dividend, attach it to 22 and continue: 224 / 64

Moving on to step 6:
When dividing 224 by 64, we get 3 with a remainder of 32.
Put 3 as the next digit of the answer. 
Result so far: 6243.0
If we subtract 192 from 224, we get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Step 7:
64 can be fit into 320 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 6243.5
Subtracting 320 from 320 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 8:
64 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 6243.5
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.

On to step 9:
If we divide 0 by 64, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 6243.5
Deduct 0 from 0 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.

Our division results in 6243.5 with a remaining 0.0.