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Interactive Addition & Subtraction on the Number Line (3rd Grade)

Dream Box – Addition on the Number Line Using Landmark Numbers.  Using an open number line, students leverage landmark numbers such as tens and hundreds to solve addition problems.  Lesson

Dream Box – Subtraction on the Number Line Using Constant Difference.  Using an open number line, students explore a compensation strategy as a vehicle to create friendly numbers to solve subtraction problems.  Lesson


Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.