We look at the division of 869623 by 90 
We want to divide 869623 by 90.

Let's proceed to step 1:
90 can be fit into 8 0 times, resulting in a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 90

Let's proceed to step 2:
The number 90 fits into 86 0 times, leaving a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Include the next digit (9) from the dividend after 86, then repeat: 869 / 90

Advancing to step 3:
If we divide 869 by 90, we get 9 and a remainder of 59.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Deduct 810 from 869 and we're left with 59.
Take the next digit (6) from the dividend and append it to 59, then repeat: 596 / 90

Step 4:
90 can be fit into 596 6 times, resulting in a remainder of 56.
Record the quotient 6 as the next digit in the result. 
Result so far: 96.0
Subtract 540 from 596 to get 56.
Append the next digit (2) from the dividend to 56 and continue with: 562 / 90

Step 5:
If we divide 562 by 90, we get 6 and a remainder of 22.
Put 6 as the next digit of the answer. 
Result so far: 966.0
Deduct 540 from 562 and we're left with 22.
Bring next digit (3) of the dividend behind the 22 and repeat the process: 223 / 90

Step 6:
When dividing 223 by 90, we get 2 with a remainder of 43.
The next digit of our result is 2. 
Result so far: 9662.0
The remainder is 43 after subtracting 180 from 223.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 7:
90 can be fit into 430 4 times, resulting in a remainder of 70.
The number 4 becomes the next digit in our result. 
Result so far: 9662.4
Subtracting 360 from 430 leaves us 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.

Moving on to step 8:
90 can be fit into 700 7 times, resulting in a remainder of 70.
The number 7 becomes the next digit in our result. 
Result so far: 9662.47
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.

On to step 9:
90 can be fit into 700 7 times, resulting in a remainder of 70.
Use 7 as the next digit of our solution. 
Result so far: 9662.477
If we take 630 away from 700, we end up 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.

The final outcome is 9662.477, with a leftover of 0.007.