645724 ÷ 18 
We want to divide 645724 by 18.

Advancing to step 1:
6 divided by 18 is 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.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 18

Let's proceed to step 2:
If we divide 64 by 18, we get 3 and a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 54 from 64, we get 10.
Include the next digit (5) from the dividend after 10, then repeat: 105 / 18

Step 3:
18 goes into 105 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
Deduct 90 from 105 and we're left with 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 18

Advancing to step 4:
The number 18 fits into 157 8 times, leaving a remainder of 13.
The number 8 becomes the next digit in our result. 
Result so far: 358.0
Deduct 144 from 157 and we're left with 13.
Take the next digit (2) from the dividend and append it to 13, then repeat: 132 / 18

Step 5:
18 can be fit into 132 7 times, resulting in a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 3587.0
If we subtract 126 from 132, we get 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 18

Step 6:
The number 18 fits into 64 3 times, leaving a remainder of 10.
The next digit of our result is 3. 
Result so far: 35873.0
If we subtract 54 from 64, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 7:
18 can be fit into 100 5 times, resulting in a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 35873.5
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
18 goes into 100 5 times with a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 35873.55
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 35873.55 with a remainder of 0.01.