518386 ÷ 42 
We're looking to find how many times 42 goes into 518386.

Advancing to step 1:
42 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 42

On to step 2:
42 can be fit into 51 1 times, resulting in a remainder of 9.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 9 after subtracting 42 from 51.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 42

Moving on to step 3:
42 goes into 98 2 times with a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 12.0
If we subtract 84 from 98, we get 14.
Take the next digit (3) from the dividend and append it to 14, then repeat: 143 / 42

Moving on to step 4:
The number 42 fits into 143 3 times, leaving a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 123.0
If we subtract 126 from 143, we get 17.
Include the next digit (8) from the dividend after 17, then repeat: 178 / 42

Going ahead to step 5:
42 can be fit into 178 4 times, resulting in a remainder of 10.
Put 4 as the next digit of the answer. 
Result so far: 1234.0
If we take 168 away from 178, we end up with 10.
Take the next digit (6) from the dividend and append it to 10, then repeat: 106 / 42

Advancing to step 6:
42 can be fit into 106 2 times, resulting in a remainder of 22.
Put 2 as the next digit of the answer. 
Result so far: 12342.0
Deduct 84 from 106 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 7:
42 goes into 220 5 times with a remainder of 10.
The next digit of our result is 5. 
Result so far: 12342.5
Deduct 210 from 220 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:
When dividing 100 by 42, we get 2 with a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 12342.52
Subtracting 84 from 100 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 9:
160 divided by 42 is 3 with a remainder of 34.
The next digit of our result is 3. 
Result so far: 12342.523
Subtract 126 from 160 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 10:
42 can be fit into 340 8 times, resulting in a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 12342.5238
Subtracting 336 from 340 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 11:
When dividing 40 by 42, we get 0 with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 12342.5238
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 12:
When dividing 400 by 42, we get 9 with a remainder of 22.
Use 9 as the next digit of our solution. 
Result so far: 12342.523809
If we take 378 away from 400, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 13:
220 divided by 42 is 5 with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 12342.5238095
Subtract 210 from 220 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.

Step 14:
42 can be fit into 100 2 times, resulting in a remainder of 16.
Use 2 as the next digit of our solution. 
Result so far: 12342.52380952
Subtract 84 from 100 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 12342.52380952 and a remainder of 1.6e-08.