We look at the division of 623990 by 64 
We want to figure out the number of times 623990 can be divided by 64.

On 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.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 64

On to step 2:
The number 64 fits into 62 0 times, leaving a remainder of 62.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 62 and we're left with 62.
Grab the next digit (3) from the dividend, add it to 62, then carry on: 623 / 64

Advancing to step 3:
64 can be fit into 623 9 times, resulting in a remainder of 47.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 576 from 623, we get 47.
Fetch the next digit (9) from the dividend, attach it to 47 and continue: 479 / 64

Advancing to step 4:
If we divide 479 by 64, we get 7 and a remainder of 31.
The next digit of our result is 7. 
Result so far: 97.0
If we subtract 448 from 479, we get 31.
Fetch the next digit (9) from the dividend, attach it to 31 and continue: 319 / 64

Advancing to step 5:
The number 64 fits into 319 4 times, leaving a remainder of 63.
Put 4 as the next digit of the answer. 
Result so far: 974.0
Subtracting 256 from 319 leaves us with 63.
Include the next digit (0) from the dividend after 63, then repeat: 630 / 64

Going ahead to step 6:
When dividing 630 by 64, we get 9 with a remainder of 54.
Use 9 as the next digit of our solution. 
Result so far: 9749.0
The remainder is 54 after subtracting 576 from 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

On to step 7:
If we divide 540 by 64, we get 8 and a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 9749.8
The remainder is 28 after subtracting 512 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 8:
The number 64 fits into 280 4 times, leaving a remainder of 24.
Write down 4 as next digit of the result. 
Result so far: 9749.84
Deduct 256 from 280 and we're left 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.

Moving on 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: 9749.843
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.

Let's proceed to step 10:
If we divide 480 by 64, we get 7 and a remainder of 32.
The number 7 becomes the next digit in our result. 
Result so far: 9749.8437
If we take 448 away from 480, we end up with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 11:
320 divided by 64 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 9749.84375
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:
When dividing 0 by 64, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 9749.84375
Subtract 0 from 0 to 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.

Let's proceed to step 13:
0 divided by 64 is 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 9749.84375
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.

Our division results in 9749.84375 with a remaining 0.0.