eh...
Don't get me wrong, I love math. Hard was almost brutal since you had 5 seconds to try and scramble through 8 possible answers, especially when you are trying to divide two numbers in your head that you have to round out the answer. For most of the answers all you had to do was multiply the numbers in the ones digit to figure out what the answer was. In that case, you might as well ask what 4x7 is rather than asking what 54x27 is since only one of the answers ends with an 8. Your not learning how to multiply larger numbers in your head, you just learning which of the answers is the most logically correct choice. If instead you had the user type in the answer instead of using multiple choice, then they would have to learn how to do arithmetic better!