9.9 Plus 21 Addition :

Number 1	Number 2	Answer
9.9	21	30.9

How to calculate 9.9 plus 21 ?

Let's break down the addition of 09.9 and 2100 step by step:

   09.9      <-- Start with the rightmost column
+  2100
---------

    Add the digits in the rightmost column:
        9 + 0 + 0 = 9
        Write down 9 in the rightmost column, carry over 0 to the next column.

   09.9
+  2100
---------
     9


    Add the digits in the rightmost column:
        9 + 1 + 1 = 10
        Write down 0 in the rightmost column, carry over 1 to the next column.

   09.9
+  2100
---------
     0.9


    Add the digits in the rightmost column:
        0 + 2 + 0 = 3
        Write down 3 in the rightmost column, carry over 0 to the next column.

   09.9
+  2100
---------
     30.9

    Continue to the left:
        There are no more columns to the left.

The final result is 30.9.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
10	22	32	10 plus 22
10.1	28	38.1	10.1 plus 28
10.2	37	47.2	10.2 plus 37
3.6	9.7	13.3	3.6 plus 9.7
8.4	2.5	10.9	8.4 plus 2.5
3.5	7.5	11	3.5 plus 7.5