1.OA.D.8. Determine the unknown whole number in an addition or subtraction equation relating to three whole numbers.
1.MD.C.4. Organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how many in each category, and how many more or less are in one category than in another.
MP.1. Make sense of problems and persevere in solving them.