Standards Map

Mathematics > Grade 2 > Number and Operations in Base Ten
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Mathematics | Grade : 2

Domain - Number and Operations in Base Ten

Cluster - Use place value understanding and properties of operations to add and subtract.

[2.NBT.B.9] - Explain why addition and subtraction strategies work, using place value and the properties of operations. [Note: Explanations may be supported by drawings or objects.]

Resources:

Predecessor Standards:

  • 1.OA.B.3
    Apply properties of operations to add. For example, when adding numbers order does not matter. 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). When adding zero to a number, the result is the same number (Identity property of zero for addition). [Note: Students need not use formal terms for these properties]
  • 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.

Successor Standards:

No Successor Standards found.

Same Level Standards:

  • 2.NBT.B.7
    Add and subtract within 1,000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.
  • 2.NBT.B.8
    Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.