I. Order to add 40.25+1.31+.45 what is the first action to do ?

The first action to do when adding multiple numbers is to start from the left and add the numbers together in order.

Therefore, the first action to do in this case is to add 40.25 and 1.31.
The sum of 40.25 and 1.31 is 41.56.

Next, we add the sum of 41.56 to the next number in the list, which is 0.45.

So, the final answer to 40.25+1.31+0.45 is:

40.25 + 1.31 + 0.45 = 41.56 + 0.45 = 41.56 + 0.45 = 42.01

Answer: \boxed{42.01}