Looking for a low-prep number sense activity? Maybe you are struggling to find new ideas for warm-ups, early finishers, math centers, or end of year activities? You have come to the right place! Broken Calculator is an activity students can complete either by themselves, with a partner, or with a group. Included is 41 different puzzles! The rules: Students must create all of the different "target numbers" using the "available keys." Students can repeat a number or operation as many times as they