Isaac checks out 5 boxes of 8 books from the library. After reading all of them, he realizes that he beat his reading goal by 3 books. What was Isaac's reading goal?
Well, first multiply the nuber of boxes times the number of books. (5x8=40)
Now, substract 40 by 3 (40-3=37)
So, 37 was Isaac's reading goal.
Hope that helped!