990668 ÷ 64 
Our goal is to divide 990668 by 64.

Step 1:
When dividing 9 by 64, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 64

Step 2:
The number 64 fits into 99 1 times, leaving a remainder of 35.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 64 from 99 and we're left with 35.
Grab the next digit (0) from the dividend, add it to 35, then carry on: 350 / 64

Advancing to step 3:
64 can be fit into 350 5 times, resulting in a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
The remainder is 30 after subtracting 320 from 350.
Bring next digit (6) of the dividend behind the 30 and repeat the process: 306 / 64

On to step 4:
When dividing 306 by 64, we get 4 with a remainder of 50.
The next digit of our result is 4. 
Result so far: 154.0
If we subtract 256 from 306, we get 50.
Include the next digit (6) from the dividend after 50, then repeat: 506 / 64

Let's proceed to step 5:
When dividing 506 by 64, we get 7 with a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 1547.0
Deduct 448 from 506 and we're left with 58.
Take the next digit (8) from the dividend and append it to 58, then repeat: 588 / 64

Moving on to step 6:
588 divided by 64 is 9 with a remainder of 12.
Record the quotient 9 as the next digit in the result. 
Result so far: 15479.0
Subtract 576 from 588 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 7:
64 goes into 120 1 times with a remainder of 56.
The number 1 becomes the next digit in our result. 
Result so far: 15479.1
If we take 64 away from 120, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 8:
The number 64 fits into 560 8 times, leaving a remainder of 48.
Put 8 as the next digit of the answer. 
Result so far: 15479.18
If we subtract 512 from 560, we 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 9:
When dividing 480 by 64, we get 7 with a remainder of 32.
The next digit of our result is 7. 
Result so far: 15479.187
The remainder is 32 after subtracting 448 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Let's proceed to step 10:
If we divide 320 by 64, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 15479.1875
If we take 320 away from 320, we end up 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.

Let's proceed to step 11:
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: 15479.1875
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.

Let's proceed to step 12:
The number 64 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 15479.1875
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.

After the division, we end up with 15479.1875 and a remainder of 0.0.