3.9 Plus 9 Addition :

Number 1	Number 2	Answer
3.9	9	12.9

How to calculate 3.9 plus 9 ?

Let's break down the addition of 3.9 and 900 step by step:

   3.9      <-- Start with the rightmost column
+  900
---------

    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.

   3.9
+  900
---------
     9


    Add the digits in the rightmost column:
        3 + 9 + 1 = 12
        Write down 2 in the rightmost column, carry over 1 to the next column.

   3.9
+  900
---------
     2.9

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

The final result is 12.9.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
4	17	21	4 plus 17
4.1	21	25.1	4.1 plus 21
4.2	30	34.2	4.2 plus 30
6	5.8	11.8	6 plus 5.8
7	7.4	14.4	7 plus 7.4
7.6	4.8	12.4	7.6 plus 4.8