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学生说明
1. 
Tag your name.
2. 
Take a photo of the number. Move it to one of the squares. Take another photo of the number to move to a square.
Continue until all squares are filled.
3. 
Say the name of the number.
4. 
老師便條 (學生不可見)
Teachers can assign any number for that day or use for finding representations of the number.
