664405 ÷ 40 
Our goal is to divide 664405 by 40.

Advancing to step 1:
The number 40 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 40

On to step 2:
40 can be fit into 66 1 times, resulting in a remainder of 26.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 40 from 66 to get 26.
Include the next digit (4) from the dividend after 26, then repeat: 264 / 40

Moving on to step 3:
If we divide 264 by 40, we get 6 and a remainder of 24.
The next digit of our result is 6. 
Result so far: 16.0
The remainder is 24 after subtracting 240 from 264.
Append the next digit (4) from the dividend to 24 and continue with: 244 / 40

Going ahead to step 4:
40 can be fit into 244 6 times, resulting in a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 166.0
Subtract 240 from 244 to get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 40

Going ahead to step 5:
The number 40 fits into 40 1 times, leaving a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1661.0
The remainder is 0 after subtracting 40 from 40.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 40

Advancing to step 6:
5 divided by 40 is 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 16610.0
Subtracting 0 from 5 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 7:
50 divided by 40 is 1 with a remainder of 10.
The next digit of our result is 1. 
Result so far: 16610.1
If we take 40 away from 50, we end up 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.

Moving on to step 8:
100 divided by 40 is 2 with a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 16610.12
Subtract 80 from 100 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 9:
When dividing 200 by 40, we get 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 16610.125
Deduct 200 from 200 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.

Moving on to step 10:
If we divide 0 by 40, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 16610.125
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.

Advancing to step 11:
40 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 16610.125
Subtract 0 from 0 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.

After the division, we end up with 16610.125 and a remainder of 0.0.