We're dividing 870994 by 90 
We're looking to find how many times 90 goes into 870994.

On to step 1:
The number 90 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the 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 / 90

Step 2:
90 goes into 87 0 times with a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Include the next digit (0) from the dividend after 87, then repeat: 870 / 90

On to step 3:
When dividing 870 by 90, we get 9 with a remainder of 60.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Deduct 810 from 870 and we're left with 60.
Include the next digit (9) from the dividend after 60, then repeat: 609 / 90

Going ahead to step 4:
The number 90 fits into 609 6 times, leaving a remainder of 69.
Use 6 as the next digit of our solution. 
Result so far: 96.0
Subtracting 540 from 609 leaves us with 69.
Bring next digit (9) of the dividend behind the 69 and repeat the process: 699 / 90

Step 5:
90 can be fit into 699 7 times, resulting in a remainder of 69.
The next digit of our result is 7. 
Result so far: 967.0
Subtracting 630 from 699 leaves us with 69.
Fetch the next digit (4) from the dividend, attach it to 69 and continue: 694 / 90

Let's proceed to step 6:
694 divided by 90 is 7 with a remainder of 64.
Write down 7 as next digit of the result. 
Result so far: 9677.0
Subtracting 630 from 694 leaves us with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Let's proceed to step 7:
When dividing 640 by 90, we get 7 with a remainder of 10.
The number 7 becomes the next digit in our result. 
Result so far: 9677.7
The remainder is 10 after subtracting 630 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
100 divided by 90 is 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 9677.71
The remainder is 10 after subtracting 90 from 100.
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 9:
When dividing 100 by 90, we get 1 with a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 9677.711
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 9677.711 with a remainder of 0.001.