======MA 02.NBT.B.9 ======


====Standard:====
MA 02.NBT.B.9   Explain why addition and subtraction strategies work, using place value and the properties of operations.1 

====Standard Unpacked:====
Explain why addition and subtraction strategies work, using place value and the properties of operations.1 
==== Lesson Plans: ====




==== Resources: ====
Good Projects here: Illustrative Mathematics https://www.illustrativemathematics.org/content-standards/2


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