### 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*

The digits are alive! So get them to a platform where they'll be part of an addition or subtraction problem. A fun easy playing game with no time limit.

*CCSS: 2.OA.B.2*

Select numbers such that they add up to 15. Choose wisely because if you don't the computer will make 15 before you do.

*CCSS: 2.OA.B.2, 3.OA.A.4*

Choose to play with addition or multiplication then move one match to make a valid equation. Complete 10 problems as quickly as possible to get a high rating.

*CCSS: 2.OA.B.2*

Activate walls to add or subtract from each ball to reach the target task number. Use your keyboard or mouse to complete all 10 levels.

*CCSS: 2.OA.B.2*

Guide your boat through the obstacle course by solving addition problems. Get all of the flags and park your boat to get to the next level. Try and get the bonus objects for a high score!

*CCSS: 2.OA.B.2*

Steer the boat through the buoys and to its parking spot. Answer subtraction problems to steer it.

*CCSS: 2.OA.B.2, 3.OA.C.7*

Steer your car by solving math equations to get through the three tough levels. Collect as many coins as you can while avoiding obstacles to get a high score.