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	12	22.1	10.1 plus 12
10.2	19	29.2	10.2 plus 19
2	4	6	2 plus 4
4.5	1.3	5.8	4.5 plus 1.3
7	3.1	10.1	7 plus 3.1