9.9 Plus 12 Addition :

Number 1	Number 2	Answer
9.9	12	21.9

How to calculate 9.9 plus 12 ?

Let's break down the addition of 09.9 and 1200 step by step:

   09.9      <-- Start with the rightmost column
+  1200
---------

    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
+  1200
---------
     9


    Add the digits in the rightmost column:
        9 + 2 + 1 = 11
        Write down 1 in the rightmost column, carry over 1 to the next column.

   09.9
+  1200
---------
     1.9


    Add the digits in the rightmost column:
        0 + 1 + 0 = 2
        Write down 2 in the rightmost column, carry over 0 to the next column.

   09.9
+  1200
---------
     21.9

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

The final result is 21.9.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
10	18	28	10 plus 18
10.1	19	29.1	10.1 plus 19
10.2	28	38.2	10.2 plus 28
3.1	4.9	8	3.1 plus 4.9
7.5	4.4	11.9	7.5 plus 4.4
4.9	5.1	10	4.9 plus 5.1