CCSS 2.OA.2 Worksheets
CCSS 2.OA.2 (Common Core, 2nd Grade): "Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers." The worksheets below practice this standard. Each one is a free printable PDF with an answer key, comes in multiple versions, and can also be assigned digitally - no login or account needed.
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