We're dividing 644315 by 16 
Our goal is to divide 644315 by 16.

On to step 1:
16 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 16

Advancing to step 2:
The number 16 fits into 64 4 times, leaving 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.
Bring next digit (4) of the dividend behind the 0 and repeat the process: 4 / 16

On to step 3:
The number 16 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 40.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 16

On to step 4:
If we divide 43 by 16, we get 2 and a remainder of 11.
Record the quotient 2 as the next digit in the result. 
Result so far: 402.0
Subtract 32 from 43 to get 11.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 16

On to step 5:
16 goes into 111 6 times with a remainder of 15.
Write down 6 as next digit of the result. 
Result so far: 4026.0
Subtracting 96 from 111 leaves us with 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 16

Moving on to step 6:
When dividing 155 by 16, we get 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 40269.0
Subtract 144 from 155 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
16 goes into 110 6 times with a remainder of 14.
Use 6 as the next digit of our solution. 
Result so far: 40269.6
If we subtract 96 from 110, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 8:
16 goes into 140 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 40269.68
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 9:
16 can be fit into 120 7 times, resulting in a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 40269.687
Deduct 112 from 120 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 10:
When dividing 80 by 16, we get 5 with a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 40269.6875
Subtracting 80 from 80 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 11:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 40269.6875
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.

Moving on to step 12:
16 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 40269.6875
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.

The quotient of the division is 40269.6875, and the remainder is 0.0.