9.9 Plus 4 Addition :

Number 1	Number 2	Answer
9.9	4	13.9

How to calculate 9.9 plus 4 ?

Let's break down the addition of 9.9 and 400 step by step:

   9.9      <-- Start with the rightmost column
+  400
---------

    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.

   9.9
+  400
---------
     9


    Add the digits in the rightmost column:
        9 + 4 + 1 = 13
        Write down 3 in the rightmost column, carry over 1 to the next column.

   9.9
+  400
---------
     3.9

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

The final result is 13.9.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
10	7	17	10 plus 7
10.1	13	23.1	10.1 plus 13
10.2	18	28.2	10.2 plus 18
8.3	2.3	10.6	8.3 plus 2.3
7.1	6	13.1	7.1 plus 6
1.2	2.9	4.1	1.2 plus 2.9