We look at the division of 870859 by 18 
Our goal is to divide 870859 by 18.

On to step 1:
The number 18 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 18

Let's proceed to step 2:
18 can be fit into 87 4 times, resulting in a remainder of 15.
The next digit of our result is 4. 
Result so far: 4.0
If we take 72 away from 87, we end up with 15.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 18

On to step 3:
18 can be fit into 150 8 times, resulting in a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 48.0
Deduct 144 from 150 and we're left with 6.
Fetch the next digit (8) from the dividend, attach it to 6 and continue: 68 / 18

On to step 4:
18 can be fit into 68 3 times, resulting in a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 483.0
If we subtract 54 from 68, we get 14.
Grab the next digit (5) from the dividend, add it to 14, then carry on: 145 / 18

Let's proceed to step 5:
If we divide 145 by 18, we get 8 and a remainder of 1.
The next digit of our result is 8. 
Result so far: 4838.0
Subtract 144 from 145 to get 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 18

Step 6:
When dividing 19 by 18, we get 1 with a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 48381.0
Deduct 18 from 19 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
The number 18 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 48381.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 8:
18 goes into 100 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 48381.05
If we subtract 90 from 100, we 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 9:
If we divide 100 by 18, we get 5 and a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 48381.055
If we subtract 90 from 100, we 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.

In conclusion, the division gives 48381.055 with a balance of 0.001.