Student Instructions

### Scratch 'Em Off (Teen Minus 10)

Today you will be playing Scratch 'Em Off to practice the subtracting 10 strategy. For a teen number minus 10, think about decreasing the tens digit by one, while the ones digit stays the same. Your goal is to play for 5-10 minutes and complete as many game boards as you can! 1. Click button to start. 2. Read the direction for how to play that game on page 1. Go to the second page to play the game. 3. Click play ▶️ and pause on the fact cube to roll the cube 🎲. 4. Solve the fact that you rolled. Say the entire fact aloud with the answer. 5. Cross (scratch) off the the problem's difference from the game board. If there is not a difference available to cross off, roll again. Work until you cross off every square. 6. On the last page, click the microphone and read each fact aloud with the answer. If you are not sure of the answer share your thinking. You may use any tool to show your work. 7. Click the check to submit your work.

3rd Grade, 2nd Grade, 5th Grade, Math
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Compatible with: Chromebooks, computers, iPads, iPhones, Android tablets, Android phones, Kindle Fire

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Teacher Notes (not visible to students)

Based on John SanGiovanni's Mastering the Basic Facts