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	22	26	4 plus 22
4.1	28	32.1	4.1 plus 28
4.2	29	33.2	4.2 plus 29
0.4	1	1.4	0.4 plus 1
1.5	4.9	6.4	1.5 plus 4.9
1	6.7	7.7	1 plus 6.7