MA 02.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

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

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