859138 ÷ 42 
We're looking to find how many times 42 goes into 859138.

Moving on to step 1:
8 divided by 42 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (5) from the dividend after 8, then repeat: 85 / 42

Step 2:
If we divide 85 by 42, we get 2 and a remainder of 1.
The next digit of our result is 2. 
Result so far: 2.0
If we take 84 away from 85, we end up with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 42

Going ahead to step 3:
When dividing 19 by 42, we get 0 with a remainder of 19.
The next digit of our result is 0. 
Result so far: 20.0
Subtracting 0 from 19 leaves us with 19.
Fetch the next digit (1) from the dividend, attach it to 19 and continue: 191 / 42

Going ahead to step 4:
42 can be fit into 191 4 times, resulting in a remainder of 23.
Record the quotient 4 as the next digit in the result. 
Result so far: 204.0
If we subtract 168 from 191, we get 23.
Append the next digit (3) from the dividend to 23 and continue with: 233 / 42

On to step 5:
If we divide 233 by 42, we get 5 and a remainder of 23.
Record the quotient 5 as the next digit in the result. 
Result so far: 2045.0
The remainder is 23 after subtracting 210 from 233.
Take the next digit (8) from the dividend and append it to 23, then repeat: 238 / 42

Moving on to step 6:
When dividing 238 by 42, we get 5 with a remainder of 28.
Put 5 as the next digit of the answer. 
Result so far: 20455.0
If we subtract 210 from 238, we 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.

Moving on to step 7:
If we divide 280 by 42, we get 6 and a remainder of 28.
The number 6 becomes the next digit in our result. 
Result so far: 20455.6
Subtracting 252 from 280 leaves us 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:
42 goes into 280 6 times with a remainder of 28.
Put 6 as the next digit of the answer. 
Result so far: 20455.66
The remainder is 28 after subtracting 252 from 280.
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 20455.66 with a remainder of 0.028.