Let's divide 646397 by 16
We're looking to find how many times 16 goes into 646397.

Moving on to step 1:
When dividing 6 by 16, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 16

Going ahead to step 2:
64 divided by 16 is 4 with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 64 from 64 to get 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 16

On to step 3:
16 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 40.0
If we take 0 away from 6, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 16

Advancing to step 4:
63 divided by 16 is 3 with a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 403.0
The remainder is 15 after subtracting 48 from 63.
Grab the next digit (9) from the dividend, add it to 15, then carry on: 159 / 16

Step 5:
159 divided by 16 is 9 with a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 4039.0
The remainder is 15 after subtracting 144 from 159.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 16

Going ahead to step 6:
If we divide 157 by 16, we get 9 and a remainder of 13.
Use 9 as the next digit of our solution. 
Result so far: 40399.0
Deduct 144 from 157 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 7:
If we divide 130 by 16, we get 8 and a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 40399.8
Subtract 128 from 130 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
If we divide 20 by 16, we get 1 and a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 40399.81
Deduct 16 from 20 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
16 goes into 40 2 times with a remainder of 8.
Record the quotient 2 as the next digit in the result. 
Result so far: 40399.812
Subtracting 32 from 40 leaves us 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.

Moving on to step 10:
The number 16 fits into 80 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 40399.8125
If we subtract 80 from 80, 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.

Let's proceed to step 11:
0 divided by 16 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 40399.8125
If we take 0 away from 0, 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.

Moving on to step 12:
If we divide 0 by 16, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 40399.8125
If we take 0 away from 0, 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.

The final result is 40399.8125 with a remainder of 0.0.