### Common Core State Standard

### 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.

*CCSS: 2.OA.B.2*

Use your addition skills in this game to clear the board by using strategy to place tiles. Don’t forget to use the power-ups to remove tiles.

*CCSS: 2.OA.B.2*

Click on numbers that add up to the given sum as quickly as you can. Get a high score and you can send a challenge to your friend!

*CCSS: 2.OA.B.2*

Get through all of the levels without letting your plane run out of gas. Answer the problems on the aircraft before they can fly off the screen.

*CCSS: 2.OA.B.2*

The addition only version of air math. Answer the addition problems on the aircraft before they can fly off the screen.

*CCSS: 2.OA.B.2*

The subtraction only version of air math. Answer the subtraction problems on the aircraft before they can fly off the screen.

*CCSS: 2.OA.B.2*

Brain Shapes is an addition and logic/puzzle game where players distribute numbers along the test test test side of different shapes. Players must distribute them such that the sum of the numbers on each side equal the target number.

*CCSS: 1.OA.C.5, 2.OA.B.2*

Click on the blocks that equal the number that Brainie is thinking of. First few levels aren't too bad. After that you'd better be quick!