CatMath app for iPhone and iPad

Train your brain with Dr. Cat!! You can become a math master!! CatMath is an app for training your brain. You can practice math with Dr. Cat who watches you closely as you are trying to solve his ten random equations. CatMath also records your calculation time and can post your results to Facebook and Twitter. Its a great brain trainer for your daily use. The more you practice, the faster you will become!! You will see progress quickly and be able to impress your friends at the next party!! Moreover, CatMath is good for kids to train their math skills. CatMath makes you a math master!!!

For each equation given you have to fill in the correct arithmetic operator.
Free version
Level 1-2: The math level is about Elementary School.
ex) A?B=C
Full version
Level 3-6: The math level is about Middle School/Junior High School.
ex) (A ? B) ? C = D and A ? B ? C = D