This powerpoint is split into 2 sections: addition up to 20 and subtraction up to 20. In the first few slides of each section, students will practice using the strategies for addition and subtraction using the number line. Students will then practice fluency with a game called "beat the computer" .Students have 7 seconds to answer the problem before the computer shows the answer. If they get it correct, they earn a point. This game helps them gain automaticity with addition and subtraction strategies.