We look at the division of 870159 by 1 
We want to figure out the number of times 870159 can be divided by 1.

Going ahead to step 1:
The number 1 fits into 8 8 times, leaving a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 8.0
Subtracting 8 from 8 leaves us with 0.
Grab the next digit (7) from the dividend, add it to 0, then carry on: 7 / 1

On to step 2:
The number 1 fits into 7 7 times, leaving a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 87.0
Deduct 7 from 7 and we're left with 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 1

Moving on to step 3:
If we divide 0 by 1, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 870.0
If we take 0 away from 0, we end up with 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 1

Step 4:
If we divide 1 by 1, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 8701.0
If we take 1 away from 1, we end up with 0.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 1

Going ahead to step 5:
5 divided by 1 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 87015.0
Subtract 5 from 5 to get 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 1

Going ahead to step 6:
If we divide 9 by 1, we get 9 and a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 870159.0
Deduct 9 from 9 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 870159.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
If we divide 0 by 1, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 870159.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 870159.0 with a balance of 0.0.