We're dividing 645638 by 64 
Let's see how many times 64 fits into 645638.

Let's proceed to step 1:
The number 64 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 64

On to step 2:
The number 64 fits into 64 1 times, leaving a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 64 from 64 to get 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 64

Going ahead to step 3:
64 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (6) from the dividend, add it to 5, then carry on: 56 / 64

Step 4:
When dividing 56 by 64, we get 0 with a remainder of 56.
Use 0 as the next digit of our solution. 
Result so far: 100.0
The remainder is 56 after subtracting 0 from 56.
Append the next digit (3) from the dividend to 56 and continue with: 563 / 64

Going ahead to step 5:
64 goes into 563 8 times with a remainder of 51.
Write down 8 as next digit of the result. 
Result so far: 1008.0
If we take 512 away from 563, we end up with 51.
Take the next digit (8) from the dividend and append it to 51, then repeat: 518 / 64

Advancing to step 6:
518 divided by 64 is 8 with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 10088.0
Subtract 512 from 518 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
64 can be fit into 60 0 times, resulting in a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 10088.0
Subtracting 0 from 60 leaves us with 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 8:
When dividing 600 by 64, we get 9 with a remainder of 24.
The number 9 becomes the next digit in our result. 
Result so far: 10088.09
The remainder is 24 after subtracting 576 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 9:
240 divided by 64 is 3 with a remainder of 48.
Put 3 as the next digit of the answer. 
Result so far: 10088.093
Subtract 192 from 240 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 10:
When dividing 480 by 64, we get 7 with a remainder of 32.
Use 7 as the next digit of our solution. 
Result so far: 10088.0937
Subtract 448 from 480 to 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.

Going ahead to step 11:
320 divided by 64 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10088.09375
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.

Advancing to step 12:
64 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 10088.09375
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.

Going ahead to step 13:
If we divide 0 by 64, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 10088.09375
If we subtract 0 from 0, we get 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 10088.09375, with a leftover of 0.0.