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	23	33.1	10.1 plus 23
10.2	24	34.2	10.2 plus 24
5.9	7.9	13.8	5.9 plus 7.9
2.4	4.7	7.1	2.4 plus 4.7
5.4	3.8	9.2	5.4 plus 3.8