Operations and Algebraic Thinking
Lessons for this standard
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Related standards
- This standard is part of: OA
- This standard is derived from: CCSS.Math.Content.1.OA.C
More specific sub-standards
Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10 and use strategies such as
Similar standards in other grades
Fluently add and subtract within 20 using mental strategies and by end of Grade 2, know from memory all sums of two one-digit numbers.
Fluently add and subtract within 100 using strategies based on place value, properties of operations and/or the relationship between addition and subtraction.
Decompose numbers less than or equal to 10 into pairs in more than one way by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1).
Add up to four two-digit numbers using strategies based on place value and properties of operations.
Similar standards elsewhere
Add and subtract within 20.