870636 divided by 85 
We're looking to find how many times 85 goes into 870636.

Moving on to step 1:
If we divide 8 by 85, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (7) from the dividend, attach it to 8 and continue: 87 / 85

On to step 2:
87 divided by 85 is 1 with a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 85 from 87 leaves us with 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 85

Advancing to step 3:
When dividing 20 by 85, we get 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 10.0
If we take 0 away from 20, we end up with 20.
Fetch the next digit (6) from the dividend, attach it to 20 and continue: 206 / 85

Going ahead to step 4:
206 divided by 85 is 2 with a remainder of 36.
Record the quotient 2 as the next digit in the result. 
Result so far: 102.0
If we subtract 170 from 206, we get 36.
Take the next digit (3) from the dividend and append it to 36, then repeat: 363 / 85

Going ahead to step 5:
If we divide 363 by 85, we get 4 and a remainder of 23.
Use 4 as the next digit of our solution. 
Result so far: 1024.0
If we subtract 340 from 363, we get 23.
Fetch the next digit (6) from the dividend, attach it to 23 and continue: 236 / 85

Moving on to step 6:
236 divided by 85 is 2 with a remainder of 66.
The number 2 becomes the next digit in our result. 
Result so far: 10242.0
Subtract 170 from 236 to get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Step 7:
85 goes into 660 7 times with a remainder of 65.
The next digit of our result is 7. 
Result so far: 10242.7
If we take 595 away from 660, we end up with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 8:
85 can be fit into 650 7 times, resulting in a remainder of 55.
Write down 7 as next digit of the result. 
Result so far: 10242.77
Deduct 595 from 650 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

The final outcome is 10242.77, with a leftover of 0.055.