# Addition Number String: First Grade

Grade 1 / Math / Tch DIY
CCSS: Math.1.OA.D.8

Common Core State Standards

 Math Math 1 Grade 1 OA Operations & Algebraic Thinking D Work with addition and subtraction equations 8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _. Download Common Core State Standards (PDF 1.2 MB)

The number string routine encourages students to think relationally about expressions using what they know about the meaning of the equal sign, operations, and their properties.

Tch visited Kristin's Gray's school. Watch the video.

Common Core Standards
Math.1.OA.D.8

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