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	10	14.1	4.1 plus 10
4.2	14	18.2	4.2 plus 14
1.7	7.5	9.2	1.7 plus 7.5
1	2.9	3.9	1 plus 2.9
0.3	3.6	3.9	0.3 plus 3.6