The sum of 23.456 90.354 and 345.1

458.910

Step-by-step explanation:

To calculate the sum, we need to add each of the numbers in order

1.       23.456

      + 90.354

          113.810

Then we add the next number to the above total, (to understand better, 345.1 is the same as 345.100-This is to make the two numbers have the same decimal places

2.        113.810

       + 345.100

          458.910

Make a points at:

(0,-4)

(2,-3) and/or (-2,-5)