2.OA.B.2 Grade 2 · Operations & Algebraic Thinking
Mental Math Within 20
What your child learns
Adding and subtracting within 20 in your head using mental strategies, and knowing all sums of two one-digit numbers from memory by the end of Grade 2.
Try it at home
Play two-minute "fact flash" in the car: you say 8 + 7, your child says 15 and explains how they got it.
Words to use
- mental math
- fact fluency
- strategy
