405009 ÷ 78 
We want to figure out the number of times 405009 can be divided by 78.

Going ahead to step 1:
78 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Take the next digit (0) from the dividend and append it to 4, then repeat: 40 / 78

On to step 2:
If we divide 40 by 78, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 40 after subtracting 0 from 40.
Take the next digit (5) from the dividend and append it to 40, then repeat: 405 / 78

On to step 3:
When dividing 405 by 78, we get 5 with a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we subtract 390 from 405, we get 15.
Take the next digit (0) from the dividend and append it to 15, then repeat: 150 / 78

Step 4:
78 goes into 150 1 times with a remainder of 72.
The next digit of our result is 1. 
Result so far: 51.0
Subtracting 78 from 150 leaves us with 72.
Bring next digit (0) of the dividend behind the 72 and repeat the process: 720 / 78

Moving on to step 5:
78 can be fit into 720 9 times, resulting in a remainder of 18.
Write down 9 as next digit of the result. 
Result so far: 519.0
Subtracting 702 from 720 leaves us with 18.
Append the next digit (9) from the dividend to 18 and continue with: 189 / 78

Advancing to step 6:
78 goes into 189 2 times with a remainder of 33.
Put 2 as the next digit of the answer. 
Result so far: 5192.0
The remainder is 33 after subtracting 156 from 189.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 7:
330 divided by 78 is 4 with a remainder of 18.
Record the quotient 4 as the next digit in the result. 
Result so far: 5192.4
Subtract 312 from 330 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 8:
If we divide 180 by 78, we get 2 and a remainder of 24.
The next digit of our result is 2. 
Result so far: 5192.42
The remainder is 24 after subtracting 156 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 9:
When dividing 240 by 78, we get 3 with a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 5192.423
If we take 234 away from 240, we end up with 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 10:
The number 78 fits into 60 0 times, leaving a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 5192.423
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 11:
When dividing 600 by 78, we get 7 with a remainder of 54.
Write down 7 as next digit of the result. 
Result so far: 5192.42307
If we subtract 546 from 600, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 12:
540 divided by 78 is 6 with a remainder of 72.
The next digit of our result is 6. 
Result so far: 5192.423076
If we take 468 away from 540, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Going ahead to step 13:
If we divide 720 by 78, we get 9 and a remainder of 18.
Record the quotient 9 as the next digit in the result. 
Result so far: 5192.4230769
The remainder is 18 after subtracting 702 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 14:
When dividing 180 by 78, we get 2 with a remainder of 24.
The number 2 becomes the next digit in our result. 
Result so far: 5192.42307692
If we take 156 away from 180, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

The quotient of the division is 5192.42307692, and the remainder is 2.4e-08.