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学生说明
Click on the 
Watch the video. Work on the attached activity pages. Make sure to write how many groups of 10 there are in the blue square.
When you are finished, click on the green 
to send to your teacher.
教师备注（学生不可见）
This is an activity with scaffolding levels. Students are introduced to groups of ten in the teens and then are asked to advance through the decades and finally to the hundreds. It purposefully challenges students to represent a number that is non proportional with digital materials (base 10, cuisenaire).
