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學生說明
1. Listen to the instaraction on each page. 2. Solve it 3. You may record your thinking 4. Submit it to your teacher
教師備註 (學生不可見)
NY-1.NBT.6 "Subtract multiples of 10 from multiples of 10 in the range 10-90 using • concrete models or drawings, and • strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. Relate the strategy used to a written representation and explain the reasoning."
