10.9 Plus 669.9 Addition :

Number 1	Number 2	Answer
10.9	669.9	680.8

How to calculate 10.9 plus 669.9 ?

Let's break down the addition of 010.9 and 669.9 step by step:

   010.9      <-- Start with the rightmost column
+  669.9
---------

    Add the digits in the rightmost column:
        9 + 9 + 1 = 18
        Write down 8 in the rightmost column, carry over 1 to the next column.

   010.9
+  669.9
---------
     8


    Add the digits in the rightmost column:
        0 + 9 + 1 = 10
        Write down 0 in the rightmost column, carry over 1 to the next column.

   010.9
+  669.9
---------
     0.8


    Add the digits in the rightmost column:
        1 + 6 + 0 = 8
        Write down 8 in the rightmost column, carry over 0 to the next column.

   010.9
+  669.9
---------
     80.8


    Add the digits in the rightmost column:
        0 + 6 + 0 = 6
        Write down 6 in the rightmost column, carry over 0 to the next column.

   010.9
+  669.9
---------
     680.8

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

The final result is 680.8.

Similar Summation Operations :

Number 1	Number 2	ANSWER:	HOW TO ?
11	673.9	684.9	11 plus 673.9
11.1	674.9	686	11.1 plus 674.9
11.2	678.9	690.1	11.2 plus 678.9
5.5	6.3	11.8	5.5 plus 6.3
9.7	5.6	15.3	9.7 plus 5.6
2.4	7.6	10	2.4 plus 7.6