Operations and algebraic thinking
1.OA.B.3
Apply the commutative and associative properties of addition as strategies.
Practice for this standard
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Addition
Sums within 10 through multi-digit column addition with regrouping, plus the fact fluency underneath.
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Mental math
Bridging ten, doubles and near doubles, compensation, and other strategies worth naming.
Official wording and the full standard: CCSS.MATH.CONTENT.1.OA.B.3