That's horrible! (The video asking what 15 multiplied by 4 is & not 1 student able to answer). I love math--I have since childhood. In fact, while shopping, especially w/my mother, I'll do many calculations in my mind. For example, I'll tell her the price of something if they're offering a discount, or which size of a certain product will actually be a better deal. I use the calculator mostly when adding or subtracting a series of numbers, like when I'm balancing my checking account.