We're dividing 861570 by 42 
We want to divide 861570 by 42.

Step 1:
The number 42 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 42

Moving on to step 2:
The number 42 fits into 86 2 times, leaving a remainder of 2.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 84 from 86, we get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 42

On to step 3:
21 divided by 42 is 0 with a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 20.0
If we subtract 0 from 21, we get 21.
Bring next digit (5) of the dividend behind the 21 and repeat the process: 215 / 42

On to step 4:
If we divide 215 by 42, we get 5 and a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 205.0
If we take 210 away from 215, we end up with 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 42

Advancing to step 5:
The number 42 fits into 57 1 times, leaving a remainder of 15.
The next digit of our result is 1. 
Result so far: 2051.0
If we subtract 42 from 57, we get 15.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 42

Going ahead to step 6:
If we divide 150 by 42, we get 3 and a remainder of 24.
Use 3 as the next digit of our solution. 
Result so far: 20513.0
Deduct 126 from 150 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 7:
42 goes into 240 5 times with a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 20513.5
Deduct 210 from 240 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
42 goes into 300 7 times with a remainder of 6.
The number 7 becomes the next digit in our result. 
Result so far: 20513.57
Subtract 294 from 300 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 9:
42 can be fit into 60 1 times, resulting in a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 20513.571
If we take 42 away from 60, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 10:
180 divided by 42 is 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 20513.5714
Deduct 168 from 180 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 11:
42 can be fit into 120 2 times, resulting in a remainder of 36.
The number 2 becomes the next digit in our result. 
Result so far: 20513.57142
Subtracting 84 from 120 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 12:
42 goes into 360 8 times with a remainder of 24.
Put 8 as the next digit of the answer. 
Result so far: 20513.571428
The remainder is 24 after subtracting 336 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 13:
If we divide 240 by 42, we get 5 and a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 20513.5714285
Subtract 210 from 240 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 14:
If we divide 300 by 42, we get 7 and a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 20513.57142857
Deduct 294 from 300 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 20513.57142857 with a remainder of 6e-09.