Grade 1 · Operations and Algebraic Thinking

CCSS.MATH.CONTENT.1.OA.A.1

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Read this standard on the official Common Core site

Lessons that teach this standard

• Addition and Subtraction Stories Within 20

  First grade word problems: add to, take from, put together, take apart and compare within 20, with the unknown in any spot, plus stories that add three numbers.