Objective: Choose and explain solution strategies and record with a written addition or subtraction method.
Grade 2 Mathematics Module 5, Topic D, Lesson 20
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Common Core Learning Standards
|2.NBT.7||Add and subtract within 1000, using concrete models or drawings and strategies based on place value...|
|2.NBT.8||Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given...|
|2.NBT.9||Explain why addition and subtraction strategies work, using place value and the properties of...|