Mathematics (2019) Grade(s): 2

MA19.2.22

Create a number line diagram using whole numbers and use it to represent whole-number sums and differences within 100.

Unpacked Content

Knowledge

Students know:
  • how to create a number line.
  • how to count forwards and backwards on a number line.
  • how to use addition and subtraction to solve equations using the number line.

Skills

Students are able to:
  • represent quantities and addition/subtraction on number line diagrams.
  • create and use number line models to represent, solve, and justify solutions to addition and subtraction problems within 100.

Understanding

Students understand that:
  • quantities can be represented as distances from zero on a number line.
  • a variety of models, including number lines, can be used to represent and solve addition and subtraction problems.

Vocabulary

  • Number line
  • Whole numbers
  • Sum
  • Difference
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