Grade 1 · Operations and Algebraic Thinking

CCSS.MATH.CONTENT.1.OA.B.4

Understand subtraction as an unknown-addend problem.

Read this standard on the official Common Core site

Lessons that teach this standard

• Subtraction and Missing Numbers

  First grade: subtract by finding a missing part, such as 10 − 8 as 8 + ? = 10, and find the missing number in any addition or subtraction sentence.