870406 ÷ 90 
Our goal is to divide 870406 by 90.

On to step 1:
8 divided by 90 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 90

Step 2:
When dividing 87 by 90, we get 0 with a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Fetch the next digit (0) from the dividend, attach it to 87 and continue: 870 / 90

Let's proceed to step 3:
870 divided by 90 is 9 with a remainder of 60.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 810 from 870 and we're left with 60.
Grab the next digit (4) from the dividend, add it to 60, then carry on: 604 / 90

Moving on to step 4:
90 can be fit into 604 6 times, resulting in a remainder of 64.
Use 6 as the next digit of our solution. 
Result so far: 96.0
If we subtract 540 from 604, we get 64.
Take the next digit (0) from the dividend and append it to 64, then repeat: 640 / 90

Going ahead to step 5:
90 can be fit into 640 7 times, resulting in a remainder of 10.
Use 7 as the next digit of our solution. 
Result so far: 967.0
Subtract 630 from 640 to get 10.
Include the next digit (6) from the dividend after 10, then repeat: 106 / 90

On to step 6:
If we divide 106 by 90, we get 1 and a remainder of 16.
Use 1 as the next digit of our solution. 
Result so far: 9671.0
Subtracting 90 from 106 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
If we divide 160 by 90, we get 1 and a remainder of 70.
Record the quotient 1 as the next digit in the result. 
Result so far: 9671.1
The remainder is 70 after subtracting 90 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 8:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 9671.17
Deduct 630 from 700 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 9:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Put 7 as the next digit of the answer. 
Result so far: 9671.177
Subtract 630 from 700 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final result is 9671.177 with a remainder of 0.007.