998899 ÷ 21 
Let's see how many times 21 fits into 998899.

Moving on to step 1:
21 goes into 9 0 times with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 21

Advancing to step 2:
99 divided by 21 is 4 with a remainder of 15.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 15 after subtracting 84 from 99.
Take the next digit (8) from the dividend and append it to 15, then repeat: 158 / 21

Moving on to step 3:
21 goes into 158 7 times with a remainder of 11.
The next digit of our result is 7. 
Result so far: 47.0
Subtracting 147 from 158 leaves us with 11.
Fetch the next digit (8) from the dividend, attach it to 11 and continue: 118 / 21

Advancing to step 4:
When dividing 118 by 21, we get 5 with a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 475.0
Subtracting 105 from 118 leaves us with 13.
Take the next digit (9) from the dividend and append it to 13, then repeat: 139 / 21

Going ahead to step 5:
21 goes into 139 6 times with a remainder of 13.
Write down 6 as next digit of the result. 
Result so far: 4756.0
If we take 126 away from 139, we end up with 13.
Append the next digit (9) from the dividend to 13 and continue with: 139 / 21

Step 6:
139 divided by 21 is 6 with a remainder of 13.
The number 6 becomes the next digit in our result. 
Result so far: 47566.0
If we subtract 126 from 139, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 7:
The number 21 fits into 130 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 47566.6
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 8:
If we divide 40 by 21, we get 1 and a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 47566.61
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 9:
21 can be fit into 190 9 times, resulting in a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 47566.619
Subtract 189 from 190 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 10:
The number 21 fits into 10 0 times, leaving a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 47566.619
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 11:
If we divide 100 by 21, we get 4 and a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 47566.61904
Subtract 84 from 100 to get 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 12:
21 goes into 160 7 times with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 47566.619047
Subtract 147 from 160 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 13:
21 goes into 130 6 times with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 47566.6190476
The remainder is 4 after subtracting 126 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 14:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The next digit of our result is 1. 
Result so far: 47566.61904761
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final outcome is 47566.61904761, with a leftover of 1.9e-08.