Operations and algebraic thinking
1.OA.C.6
Add and subtract within 20; fluently add and subtract within 10.
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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Subtraction
Taking away, counting up, and multi-digit subtraction with borrowing across zeros.
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Mental math
Bridging ten, doubles and near doubles, compensation, and other strategies worth naming.
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Mixed operations
One sheet, all four operations, so a student has to choose the operation instead of repeating one.
Official wording and the full standard: CCSS.MATH.CONTENT.1.OA.C.6