1.OA.6

Grade 1 · Operations & Algebraic Thinking

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 — 4 = 13 — 3 — 1 = 10 — 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 — 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Official code: CCSS.MATH.CONTENT.1.OA.6
Short code: 1.OA.6
Subject: Mathematics
Grade: Grade 1
Domain: Operations & Algebraic Thinking

More Grade 1 Operations & Algebraic Thinking standards

1.OA Operations and Algebraic Thinking 1.OA.1 Use addition and subtraction within 20 to solve word problems involving situations of... 1.OA.2 Solve word problems that call for addition of three whole numbers whose sum is less... 1.OA.3 Apply properties of operations as strategies to add and subtract. 1.OA.4 Understand subtraction as an unknown-addend problem. 1.OA.5 Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). 1.OA.7 Understand the meaning of the equal sign, and determine if equations involving... 1.OA.8 Determine the unknown whole number in an addition or subtraction equation relating...

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