In this real-life problem solving activity, students will use thier addition and subtraction skills to plan the items needed to throw a party. Students are told that there are 28 people coming to the party (this number can be adjusted, though!) and they must ESTIMATE how much they think it will cost to throw the party. They are given a chart to that tells them how many of a certain item comes in a pack (for example, 8 hot dogs in one package, 10 hot dog buns in one package, a 2 liter drink will serve 9 drinks, etc...) They use the following pages to draw a picture, write a number sentence, calculate the total cost of the item, and how many of each item will be left over. Students then take this information to fill in the missing information on the chart. At the end, the students calculate the total cost of the party and find the difference between the actual cost and their estimate.