645071 divided by 42 
We want to divide 645071 by 42.

Let's proceed to step 1:
When dividing 6 by 42, we get 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 42

Advancing to step 2:
When dividing 64 by 42, we get 1 with a remainder of 22.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 42 away from 64, we end up with 22.
Append the next digit (5) from the dividend to 22 and continue with: 225 / 42

On to step 3:
42 can be fit into 225 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 15.0
The remainder is 15 after subtracting 210 from 225.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 42

Going ahead to step 4:
150 divided by 42 is 3 with a remainder of 24.
Record the quotient 3 as the next digit in the result. 
Result so far: 153.0
Subtract 126 from 150 to get 24.
Take the next digit (7) from the dividend and append it to 24, then repeat: 247 / 42

Going ahead to step 5:
If we divide 247 by 42, we get 5 and a remainder of 37.
The number 5 becomes the next digit in our result. 
Result so far: 1535.0
The remainder is 37 after subtracting 210 from 247.
Grab the next digit (1) from the dividend, add it to 37, then carry on: 371 / 42

Advancing to step 6:
If we divide 371 by 42, we get 8 and a remainder of 35.
Put 8 as the next digit of the answer. 
Result so far: 15358.0
Deduct 336 from 371 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 7:
If we divide 350 by 42, we get 8 and a remainder of 14.
The number 8 becomes the next digit in our result. 
Result so far: 15358.8
If we subtract 336 from 350, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 8:
42 can be fit into 140 3 times, resulting in a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 15358.83
The remainder is 14 after subtracting 126 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 9:
The number 42 fits into 140 3 times, leaving a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 15358.833
Deduct 126 from 140 and we're left 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 15358.833, with a leftover of 0.0014.