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Math Standard 2.NBT.B.9

  • Major Standards
  • Supporting Standards
  • Additional Standards

Explain why addition and subtraction strategies work, using place value and the properties of operations.1

Part of Major Cluster 2.NBT.B
View 59 lessons for this standard
View 48 activities for this standard
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Prerequisites

1st Grade

1.OA.B.3

Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)

1.OA.B.4

Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

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