353643 ÷ 15 
We want to figure out the number of times 353643 can be divided by 15.

Let's proceed to step 1:
15 can be fit into 3 0 times, resulting in a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (5) from the dividend after 3, then repeat: 35 / 15

Moving on to step 2:
If we divide 35 by 15, we get 2 and a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 30 from 35 and we're left with 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 15

On to step 3:
The number 15 fits into 53 3 times, leaving a remainder of 8.
Use 3 as the next digit of our solution. 
Result so far: 23.0
If we take 45 away from 53, we end up with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 15

On to step 4:
When dividing 86 by 15, we get 5 with a remainder of 11.
The next digit of our result is 5. 
Result so far: 235.0
Subtract 75 from 86 to get 11.
Append the next digit (4) from the dividend to 11 and continue with: 114 / 15

Moving on to step 5:
114 divided by 15 is 7 with a remainder of 9.
Use 7 as the next digit of our solution. 
Result so far: 2357.0
Subtracting 105 from 114 leaves us with 9.
Fetch the next digit (3) from the dividend, attach it to 9 and continue: 93 / 15

On to step 6:
If we divide 93 by 15, we get 6 and a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 23576.0
If we take 90 away from 93, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
If we divide 30 by 15, we get 2 and a remainder of 0.
The next digit of our result is 2. 
Result so far: 23576.2
Deduct 30 from 30 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.

Advancing to step 8:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 23576.2
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.

Step 9:
If we divide 0 by 15, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 23576.2
If we subtract 0 from 0, 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.

The final outcome is 23576.2, with a leftover of 0.0.