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学生说明
1. Tap on the :button:.
2. On slides 1-4, click and drag cubes into the 10 frames to match the given number.
3. On slides 5-8, finish filling in the 10 frames by clicking and dragging the cubes to match the number shown.
4. Tap on the 
mark when you are done.
教师备注（学生不可见）
This is the practice for Digital Guided Math Kindergarten Unit 2: Numbers 11-20 eLesson 2: Building Sets
