3.9 Plus 21 Addition :

Number 1	Number 2	Answer
3.9	21	24.9

How to calculate 3.9 plus 21 ?

Let's break down the addition of 03.9 and 2100 step by step:

   03.9      <-- Start with the rightmost column
+  2100
---------

    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.

   03.9
+  2100
---------
     9


    Add the digits in the rightmost column:
        3 + 1 + 0 = 4
        Write down 4 in the rightmost column, carry over 0 to the next column.

   03.9
+  2100
---------
     4.9


    Add the digits in the rightmost column:
        0 + 2 + 0 = 2
        Write down 2 in the rightmost column, carry over 0 to the next column.

   03.9
+  2100
---------
     24.9

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

The final result is 24.9.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
4	27	31	4 plus 27
4.1	35	39.1	4.1 plus 35
4.2	44	48.2	4.2 plus 44
1.9	7.4	9.3	1.9 plus 7.4
3.2	7.2	10.4	3.2 plus 7.2
3.5	2	5.5	3.5 plus 2