Question

Three girls each earned $2.55 how much did the three girls earn altogether

Answer 1

Each earned $2.55, so all you have to do is multiply it by 3. ( multiplying a value by a number is the same thing as adding that value the same number of times as that same number.

Look-

 2.55
 2.55
+2.55
---------
7.65

2.55 * 3= also $7.65

See?

Hope I helped you learn something new today!

Answer 2

You can add $2.55 three times; or you can multiply $2.55 times 3. Either way you will have the answer of $7.65 as your total. 

I hope that helped you. (: