513807 divided by 42 
We're looking to find how many times 42 goes into 513807.

Moving on to step 1:
5 divided by 42 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 42

On to step 2:
The number 42 fits into 51 1 times, leaving a remainder of 9.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 42 from 51, we get 9.
Include the next digit (3) from the dividend after 9, then repeat: 93 / 42

Let's proceed to step 3:
If we divide 93 by 42, we get 2 and a remainder of 9.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 84 from 93, we get 9.
Take the next digit (8) from the dividend and append it to 9, then repeat: 98 / 42

Moving on to step 4:
42 can be fit into 98 2 times, resulting in a remainder of 14.
The next digit of our result is 2. 
Result so far: 122.0
Subtracting 84 from 98 leaves us with 14.
Grab the next digit (0) from the dividend, add it to 14, then carry on: 140 / 42

On to step 5:
42 can be fit into 140 3 times, resulting in a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 1223.0
Deduct 126 from 140 and we're left with 14.
Bring next digit (7) of the dividend behind the 14 and repeat the process: 147 / 42

Advancing to step 6:
147 divided by 42 is 3 with a remainder of 21.
Put 3 as the next digit of the answer. 
Result so far: 12233.0
The remainder is 21 after subtracting 126 from 147.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Moving on to step 7:
42 can be fit into 210 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 12233.5
If we subtract 210 from 210, 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.

Going ahead to step 8:
42 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 12233.5
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:
The number 42 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 12233.5
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 12233.5 and a remainder of 0.0.