This is a great idea! Motivate kids to get rid of all of that candy for a good cause.
Operation Gratitude and dentists are encouraging healthy eating, motivated giving, and offering a good use for all of that leftover candy.
the activity: Buying-back-Halloween-candy.pdf
If you want to give students some prices for buying candy: SomeCandyDeals.pdf
CCSS: 5.MD.1, 5.NBT.4, 5.NBT.5, 5.NBT.6, 5.NBT.7, 6.RP.1, 6.RP.2, 6.RP.3
For members we have an editable Word docx and solutions.