We look at the division of 851648 by 42 
Let's see how many times 42 fits into 851648.

Advancing to step 1:
42 can be fit into 8 0 times, resulting in a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (5) of the dividend behind the 8 and repeat the process: 85 / 42

On to step 2:
42 goes into 85 2 times with a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 84 from 85 leaves us with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 42

Going ahead to step 3:
When dividing 11 by 42, we get 0 with a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Subtract 0 from 11 to get 11.
Bring next digit (6) of the dividend behind the 11 and repeat the process: 116 / 42

Going ahead to step 4:
116 divided by 42 is 2 with a remainder of 32.
The next digit of our result is 2. 
Result so far: 202.0
Subtracting 84 from 116 leaves us with 32.
Take the next digit (4) from the dividend and append it to 32, then repeat: 324 / 42

Advancing to step 5:
324 divided by 42 is 7 with a remainder of 30.
Use 7 as the next digit of our solution. 
Result so far: 2027.0
If we subtract 294 from 324, we get 30.
Fetch the next digit (8) from the dividend, attach it to 30 and continue: 308 / 42

Let's proceed to step 6:
The number 42 fits into 308 7 times, leaving a remainder of 14.
The next digit of our result is 7. 
Result so far: 20277.0
Subtracting 294 from 308 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 7:
If we divide 140 by 42, we get 3 and a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 20277.3
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
42 goes into 140 3 times with a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 20277.33
If we take 126 away from 140, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 20277.33, with a leftover of 0.014.