636441 ÷ 15 
We're looking to find how many times 15 goes into 636441.

Advancing to step 1:
15 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 15

Moving on to step 2:
63 divided by 15 is 4 with a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 60 away from 63, we end up with 3.
Append the next digit (6) from the dividend to 3 and continue with: 36 / 15

Advancing to step 3:
The number 15 fits into 36 2 times, leaving a remainder of 6.
Write down 2 as next digit of the result. 
Result so far: 42.0
Subtract 30 from 36 to get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 15

Advancing to step 4:
If we divide 64 by 15, we get 4 and a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 424.0
Deduct 60 from 64 and we're left with 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 15

Step 5:
When dividing 44 by 15, we get 2 with a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 4242.0
The remainder is 14 after subtracting 30 from 44.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 15

Moving on to step 6:
The number 15 fits into 141 9 times, leaving a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 42429.0
If we subtract 135 from 141, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 7:
The number 15 fits into 60 4 times, leaving a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 42429.4
Subtract 60 from 60 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.

Going ahead to step 8:
When dividing 0 by 15, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 42429.4
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.

Advancing to step 9:
15 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 42429.4
The remainder is 0 after subtracting 0 from 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 42429.4 with a remainder of 0.0.