89721949 ÷ 90 
We want to figure out the number of times 89721949 can be divided by 90.

Going ahead to step 1:
If we divide 8 by 90, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 90

Let's proceed to step 2:
90 goes into 89 0 times with a remainder of 89.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 89 after subtracting 0 from 89.
Take the next digit (7) from the dividend and append it to 89, then repeat: 897 / 90

Advancing to step 3:
If we divide 897 by 90, we get 9 and a remainder of 87.
Record the quotient 9 as the next digit in the result. 
Result so far: 9.0
Subtracting 810 from 897 leaves us with 87.
Take the next digit (2) from the dividend and append it to 87, then repeat: 872 / 90

On to step 4:
If we divide 872 by 90, we get 9 and a remainder of 62.
The next digit of our result is 9. 
Result so far: 99.0
If we subtract 810 from 872, we get 62.
Fetch the next digit (1) from the dividend, attach it to 62 and continue: 621 / 90

On to step 5:
621 divided by 90 is 6 with a remainder of 81.
The next digit of our result is 6. 
Result so far: 996.0
If we take 540 away from 621, we end up with 81.
Bring next digit (9) of the dividend behind the 81 and repeat the process: 819 / 90

On to step 6:
The number 90 fits into 819 9 times, leaving a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 9969.0
If we take 810 away from 819, we end up with 9.
Include the next digit (4) from the dividend after 9, then repeat: 94 / 90

Let's proceed to step 7:
The number 90 fits into 94 1 times, leaving a remainder of 4.
Use 1 as the next digit of our solution. 
Result so far: 99691.0
If we take 90 away from 94, we end up with 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 90

On to step 8:
When dividing 49 by 90, we get 0 with a remainder of 49.
The number 0 becomes the next digit in our result. 
Result so far: 996910.0
If we take 0 away from 49, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 9:
The number 90 fits into 490 5 times, leaving a remainder of 40.
The number 5 becomes the next digit in our result. 
Result so far: 996910.5
Deduct 450 from 490 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 10:
90 goes into 400 4 times with a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 996910.54
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 11:
If we divide 400 by 90, we get 4 and a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 996910.544
Subtract 360 from 400 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Our division results in 996910.544 with a remaining 0.004.