Mathematics (2019) Grade(s): 2

MA19.2.12

Add and subtract within 1000 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.

Unpacked Content

Knowledge

Students know:
  • how to count to 1,000.
  • how to identify hundreds, tens, and ones.
  • how to compose numbers.
  • how to decompose two digit numbers.
  • how to record strategies for solving addition and subtraction problems.

Skills

Students are able to:
  • add and subtract within 1000.
  • model addition problems using visual models.
  • record strategies for solving addition problems.
  • communicate the relationship between models and symbolic (numeric) representations.

Understanding

Students understand that:
  • relationships between models of addition/subtraction problems and written strategies of those models can be used to justify solutions.

Vocabulary

  • Compose
  • Decompose
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