99421889 ÷ 623 
We want to figure out the number of times 99421889 can be divided by 623.

Advancing to step 1:
623 goes into 9 0 times with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 623

Step 2:
99 divided by 623 is 0 with a remainder of 99.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Fetch the next digit (4) from the dividend, attach it to 99 and continue: 994 / 623

On to step 3:
If we divide 994 by 623, we get 1 and a remainder of 371.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 623 from 994 and we're left with 371.
Take the next digit (2) from the dividend and append it to 371, then repeat: 3712 / 623

Advancing to step 4:
623 goes into 3712 5 times with a remainder of 597.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
Subtracting 3115 from 3712 leaves us with 597.
Grab the next digit (1) from the dividend, add it to 597, then carry on: 5971 / 623

Going ahead to step 5:
The number 623 fits into 5971 9 times, leaving a remainder of 364.
Use 9 as the next digit of our solution. 
Result so far: 159.0
Deduct 5607 from 5971 and we're left with 364.
Append the next digit (8) from the dividend to 364 and continue with: 3648 / 623

Step 6:
623 goes into 3648 5 times with a remainder of 533.
The next digit of our result is 5. 
Result so far: 1595.0
Subtract 3115 from 3648 to get 533.
Fetch the next digit (8) from the dividend, attach it to 533 and continue: 5338 / 623

On to step 7:
5338 divided by 623 is 8 with a remainder of 354.
Record the quotient 8 as the next digit in the result. 
Result so far: 15958.0
Subtracting 4984 from 5338 leaves us with 354.
Take the next digit (9) from the dividend and append it to 354, then repeat: 3549 / 623

Going ahead to step 8:
623 goes into 3549 5 times with a remainder of 434.
Write down 5 as next digit of the result. 
Result so far: 159585.0
If we subtract 3115 from 3549, we get 434.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4340, and continue the process.

Step 9:
623 goes into 4340 6 times with a remainder of 602.
Record the quotient 6 as the next digit in the result. 
Result so far: 159585.6
Deduct 3738 from 4340 and we're left with 602.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6020, and continue the process.

On to step 10:
The number 623 fits into 6020 9 times, leaving a remainder of 413.
Put 9 as the next digit of the answer. 
Result so far: 159585.69
The remainder is 413 after subtracting 5607 from 6020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4130, and continue the process.

Let's proceed to step 11:
623 goes into 4130 6 times with a remainder of 392.
The next digit of our result is 6. 
Result so far: 159585.696
Deduct 3738 from 4130 and we're left with 392.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3920, and continue the process.

On to step 12:
When dividing 3920 by 623, we get 6 with a remainder of 182.
Record the quotient 6 as the next digit in the result. 
Result so far: 159585.6966
If we take 3738 away from 3920, we end up with 182.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1820, and continue the process.

In conclusion, the division gives 159585.6966 with a balance of 0.00182.