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学生说明
Use any tools, shapes, etc. to show how you add the big numbers on the two pages.
You can use 
or 
Use 
to talk about your thinking and tell how you added the numbers.
when you are done.
教师备注（学生不可见）
Give this activity to students before teaching any two digit addition strategies. Use it to find out which strategies students are already using. Then group students or plan lessons according to differentiated needs.
