## 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.

24 Lesson(s)

#### The big idea of this lesson is that students can solve for near doubles by thinking of the related doubles fact.

#### Making ten is one of the foundational strategies for developing flexible numerical thinking, accuracy, and efficiency.

Big Idea: