Standard
- CCSS.Math.Content.2.OA
- Operations and Algebraic Thinking
- CCSS.Math.Content.2.OA.B
- 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.