Mathematics (2019) Grade(s): 1

MA19.1.8

Solve for the unknown whole number in various positions in an addition or subtraction equation, relating three whole numbers that would make it true.

COS Examples

Example: determining the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? - 3, and 6 + 6 = ?

Unpacked Content

Knowledge

Students know:
  • Strategies for solving simple addition or subtraction equations with one unknown.

Skills

Students are able to:
  • solve simple addition and subtraction equations.
  • Justify and explain their thinking.

Understanding

Students understand that:
  • equalities contain expressions that name the same amount on each side of the equal sign, even with quantities unknown.

Vocabulary

  • Equation
  • ALSDE LOGO