Operations and algebraic thinking
2.OA.A.1
Use addition and subtraction within 100 to solve one- and two-step word problems.
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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Word problems
One- and two-step story problems, with the reading strategy taught alongside the math.
Official wording and the full standard: CCSS.MATH.CONTENT.2.OA.A.1