3.9 Plus 4 Addition :

Number 1	Number 2	Answer
3.9	4	7.9

How to calculate 3.9 plus 4 ?

Let's break down the addition of 3.9 and 400 step by step:

   3.9      <-- 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.

   3.9
+  400
---------
     9


    Add the digits in the rightmost column:
        3 + 4 + 0 = 7
        Write down 7 in the rightmost column, carry over 0 to the next column.

   3.9
+  400
---------
     7.9

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

The final result is 7.9.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
4	6	10	4 plus 6
4.1	13	17.1	4.1 plus 13
4.2	17	21.2	4.2 plus 17
1.5	8.2	9.7	1.5 plus 8.2
9.3	9.9	19.2	9.3 plus 9.9
6.5	1.1	7.6	6.5 plus 1.1