Second Grade Common Core Math 2 NBT.9 Addition & Subtraction Strategy Word Problems 2.NBT.9 Practice provides two ways for students to practice addition and subtraction strategies.
It includes 40 distinct problems in two sets (129 slides in all!), with and without following answer slides. The PowerPoint file can be used on computers, or Promethean Activboard and Smart boards.
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Use place value understanding and properties of operations to add
9. Explain why addition and subtraction strategies work, using place value and the properties of operations