We're dividing 640446 by 16 
We're looking to find how many times 16 goes into 640446.

On to step 1:
16 can be fit into 6 0 times, resulting in a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 16

Let's proceed to step 2:
When dividing 64 by 16, we get 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 64 from 64 to get 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 16

On to step 3:
When dividing 0 by 16, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Subtracting 0 from 0 leaves us with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 16

Advancing to step 4:
16 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 400.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (4) from the dividend and append it to 4, then repeat: 44 / 16

Moving on to step 5:
When dividing 44 by 16, we get 2 with a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 4002.0
Subtracting 32 from 44 leaves us with 12.
Fetch the next digit (6) from the dividend, attach it to 12 and continue: 126 / 16

Going ahead to step 6:
The number 16 fits into 126 7 times, leaving a remainder of 14.
Use 7 as the next digit of our solution. 
Result so far: 40027.0
Deduct 112 from 126 and we're left 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.

On to step 7:
16 can be fit into 140 8 times, resulting in a remainder of 12.
The next digit of our result is 8. 
Result so far: 40027.8
If we subtract 128 from 140, we 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.

On to step 8:
If we divide 120 by 16, we get 7 and a remainder of 8.
Record the quotient 7 as the next digit in the result. 
Result so far: 40027.87
The remainder is 8 after subtracting 112 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 9:
16 can be fit into 80 5 times, resulting in a remainder of 0.
The next digit of our result is 5. 
Result so far: 40027.875
Subtract 80 from 80 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.

On to step 10:
16 goes into 0 0 times with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 40027.875
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.

On to step 11:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 40027.875
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.

The final result is 40027.875 with a remainder of 0.0.