We divide 880643 by 90
We want to figure out the number of times 880643 can be divided by 90.

Step 1:
8 divided by 90 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (8) from the dividend, add it to 8, then carry on: 88 / 90

Step 2:
The number 90 fits into 88 0 times, leaving a remainder of 88.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 88 and we're left with 88.
Include the next digit (0) from the dividend after 88, then repeat: 880 / 90

On to step 3:
90 goes into 880 9 times with a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
If we take 810 away from 880, we end up with 70.
Fetch the next digit (6) from the dividend, attach it to 70 and continue: 706 / 90

Advancing to step 4:
When dividing 706 by 90, we get 7 with a remainder of 76.
The next digit of our result is 7. 
Result so far: 97.0
If we subtract 630 from 706, we get 76.
Fetch the next digit (4) from the dividend, attach it to 76 and continue: 764 / 90

Step 5:
If we divide 764 by 90, we get 8 and a remainder of 44.
Write down 8 as next digit of the result. 
Result so far: 978.0
The remainder is 44 after subtracting 720 from 764.
Take the next digit (3) from the dividend and append it to 44, then repeat: 443 / 90

Going ahead to step 6:
90 can be fit into 443 4 times, resulting in a remainder of 83.
Record the quotient 4 as the next digit in the result. 
Result so far: 9784.0
If we subtract 360 from 443, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Advancing to step 7:
When dividing 830 by 90, we get 9 with a remainder of 20.
The number 9 becomes the next digit in our result. 
Result so far: 9784.9
If we take 810 away from 830, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 8:
90 can be fit into 200 2 times, resulting in a remainder of 20.
Use 2 as the next digit of our solution. 
Result so far: 9784.92
If we subtract 180 from 200, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
90 goes into 200 2 times with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 9784.922
Subtracting 180 from 200 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 9784.922, with a leftover of 0.002.