15969055 divided by 644 
We're looking to find how many times 644 goes into 15969055.

Advancing to step 1:
1 divided by 644 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 644

Let's proceed to step 2:
15 divided by 644 is 0 with a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 644

Advancing to step 3:
If we divide 159 by 644, we get 0 and a remainder of 159.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 159 leaves us with 159.
Include the next digit (6) from the dividend after 159, then repeat: 1596 / 644

Step 4:
When dividing 1596 by 644, we get 2 with a remainder of 308.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 1288 from 1596 and we're left with 308.
Fetch the next digit (9) from the dividend, attach it to 308 and continue: 3089 / 644

On to step 5:
If we divide 3089 by 644, we get 4 and a remainder of 513.
The next digit of our result is 4. 
Result so far: 24.0
Deduct 2576 from 3089 and we're left with 513.
Include the next digit (0) from the dividend after 513, then repeat: 5130 / 644

Let's proceed to step 6:
The number 644 fits into 5130 7 times, leaving a remainder of 622.
Put 7 as the next digit of the answer. 
Result so far: 247.0
If we take 4508 away from 5130, we end up with 622.
Append the next digit (5) from the dividend to 622 and continue with: 6225 / 644

Advancing to step 7:
If we divide 6225 by 644, we get 9 and a remainder of 429.
Use 9 as the next digit of our solution. 
Result so far: 2479.0
Subtract 5796 from 6225 to get 429.
Bring next digit (5) of the dividend behind the 429 and repeat the process: 4295 / 644

Moving on to step 8:
If we divide 4295 by 644, we get 6 and a remainder of 431.
Use 6 as the next digit of our solution. 
Result so far: 24796.0
The remainder is 431 after subtracting 3864 from 4295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4310, and continue the process.

Step 9:
The number 644 fits into 4310 6 times, leaving a remainder of 446.
Put 6 as the next digit of the answer. 
Result so far: 24796.6
Subtract 3864 from 4310 to get 446.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4460, and continue the process.

Let's proceed to step 10:
644 can be fit into 4460 6 times, resulting in a remainder of 596.
The number 6 becomes the next digit in our result. 
Result so far: 24796.66
If we take 3864 away from 4460, we end up with 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

The quotient of the division is 24796.66, and the remainder is 0.596.