This activity will have your students asking for more!!! Subtract numbers from 20 in a fun and engaging way! This slide begins with a riddle for your students to solve. Each subtraction question provides a letter clue along the way. The moveable X helps students to cross out the items. Students subtract with a purpose. They can keep track of the differences and use them to crack the code at the end of the game! SO MUCH FUN!!!! Perfect to use as a whole class activity on the interactive whiteboard, assign as a math centre or assessment piece. Google Classroom ready! Easy for Distance Learning or Remote Learning. Goodle Slides format.