One of my favorite things to do is to use actual data that sparks interest in the students. For this activity, we used the website: http://www.businessinsider.com/the-highest-grossing-movies-of-all-time-adjusted-for-inflation-2016-9
It sparked great conversation about the vocabulary - inflation, gross, adjusted and unadjusted.
This activity is designed to challenge students who have a basic understanding of rounding, adding, subtracting and multiplicative comparisons.
The activity is comprised of 10 problems including a challenge problem that should promote the use of a ratio table!
It also should spark some great conversation about which place value is the best to round to!