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Home / Teaching Resources / Grade 2 / Standards for Mathematical Practice / Operations & Algebraic Thinking / Add and subtract within 20 / CCSS.MATH.CONTENT.2.OA.B.2
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.
(View this topic on www.corestandards.org )