Skill Sharpener – Calculus Intro Review

This is my Favorite App!!!!!! I love the way it's designed to force you to ponder & solve the problem without the use of aids like paper, pen or calculator. It forces you 2 use your brain only to solve the problem! It sharpens your math wits! Great, great app! I do it everywhere I go in -5 minute increments at work on break or on the bus! It makes me smarter! Thanks creator! Also, the music is pleasant to listen to as you solve the problem. Yeah math!
Review by ahavta77 on Calculus Intro.