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学生说明
1. Tap 
2. Use the 
tool to type the numbers into the table.
3. 
your work
教师备注（学生不可见）
Extension for grade 3. Number sense rounding 10s, 100s and 1000s up to 5-digit numbers. use this template to adjust the master graphic. https://docs.google.com/presentation/d/1mjhof46cJl9jJ-HJDhEEbgIhjk-0svhebxi20_55-gQ/copy
