This is great as a project or HW assignment. Could be completed in pairs or individually.
Students make a grocery list with their family and estimate the price of each item. Then students go to the grocery store with their family and fill out the actual cost of each item. Students find the sum for each column and calculate the difference between their estimated cost and actual cost. Short answer question what did you learn from this activity?
*for extra credit you could add a piece about state tax!