Let's divide 409591 by 42
We're looking to find how many times 42 goes into 409591.

On to step 1:
42 can be fit into 4 0 times, resulting in a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 42

On to step 2:
If we divide 40 by 42, we get 0 and a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 40 to get 40.
Append the next digit (9) from the dividend to 40 and continue with: 409 / 42

Going ahead to step 3:
409 divided by 42 is 9 with a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 9.0
The remainder is 31 after subtracting 378 from 409.
Append the next digit (5) from the dividend to 31 and continue with: 315 / 42

On to step 4:
If we divide 315 by 42, we get 7 and a remainder of 21.
Record the quotient 7 as the next digit in the result. 
Result so far: 97.0
If we take 294 away from 315, we end up with 21.
Take the next digit (9) from the dividend and append it to 21, then repeat: 219 / 42

Moving on to step 5:
42 goes into 219 5 times with a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 975.0
Subtracting 210 from 219 leaves us with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 42

Going ahead to step 6:
If we divide 91 by 42, we get 2 and a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 9752.0
The remainder is 7 after subtracting 84 from 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
When dividing 70 by 42, we get 1 with a remainder of 28.
Put 1 as the next digit of the answer. 
Result so far: 9752.1
Deduct 42 from 70 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 8:
280 divided by 42 is 6 with a remainder of 28.
Record the quotient 6 as the next digit in the result. 
Result so far: 9752.16
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 9:
42 goes into 280 6 times with a remainder of 28.
Write down 6 as next digit of the result. 
Result so far: 9752.166
Subtract 252 from 280 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The final result is 9752.166 with a remainder of 0.0028.