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	12	16	4 plus 12
4.1	16	20.1	4.1 plus 16
4.2	20	24.2	4.2 plus 20
7.2	5.6	12.8	7.2 plus 5.6
9.4	7.8	17.2	9.4 plus 7.8
1.4	1.6	3	1.4 plus 1.6