# Add and Subtract Within 20 Math Games

In this series of games, your students will learn to add and subtract within 20. The Add and Subtract Within 20 learning objective — based on CCSS and state standards — delivers improved student engagement and academic performance in your classroom, as demonstrated by research. This learning objective directly references 1.OA.C.6 as written in the common core national math standards.

Scroll down for a preview of this learning objective’s games and the concepts.

## Concepts Covered

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Decompose numbers leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9). Use the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4). Create equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

A preview of each game in the learning objective is found below.

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