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	18	22	4 plus 18
4.1	23	27.1	4.1 plus 23
4.2	31	35.2	4.2 plus 31
4.8	9.6	14.4	4.8 plus 9.6
4.2	8.2	12.4	4.2 plus 8.2
6.7	4.4	11.1	6.7 plus 4.4