0.9 Plus 21 Addition :

Number 1	Number 2	Answer
0.9	21	21.9

How to calculate 0.9 plus 21 ?

Let's break down the addition of 00.9 and 2100 step by step:

   00.9      <-- 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.

   00.9
+  2100
---------
     9


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

   00.9
+  2100
---------
     1.9


    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.

   00.9
+  2100
---------
     21.9

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

The final result is 21.9.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
1	30	31	1 plus 30
1.1	37	38.1	1.1 plus 37
1.2	43	44.2	1.2 plus 43
9.1	3.3	12.4	9.1 plus 3.3
9.2	4.4	13.6	9.2 plus 4.4
1	7.9	8.9	1 plus 7.9