iDevBooks - Educational Math Apps, by Esa Helttula, are par excellence when it comes to educational tools! This suite of apps is a must-have for any school using mobile devices, as well as for parents who want to encourage mastery of math concepts for their children. A collection of 16 iPhone, iPod Touch, and iPad educational math apps with easy to use and intuitive interfaces. The iDevBooks math apps are used by schools, parents, and students worldwide. They are also popular in special education. These apps have been on our radar to review for quite some time now. Classroom teachers - these apps contain remarkable lessons, almost like a video, the numbers move to their correct placement to demonstrate the appropriate algorithm or concept. Parents - these apps provide clarification and ample practice for your child to master math skills on the go. Everyone - these apps are straight up, without bells and whistles, fun for kids because they are easy to follow and give the user a feeling of an "aha" moment and a sense of satisfaction as concepts are understood. Each app is very specific and can help students learn and master the targeted concept or strategy easily. The fifth-grade teacher in our district that I co-teach with was so excited to learn of these apps, we couldn't wait to share lattice multiplication with our students! I scurried to get a cord to hook up the iPad to the SmartBoard only to learn that the connectivity only works for the iPad 2. What a disappointment that was! From what we were told, this is another Apple thing. They could have made the cord work for both devices, but didn't. That won't stop the lesson, we will use the Document Reader to show the students the lattice method for multiplication or see if we can borrow someone's iPad 2. The app does an incredible job of showing just how this concept works and helps the students "see" where the numbers go. Esa Helttula has developed an invaluable math resource. Here is what he has to say: "About my elementary math algorithm apps I could tell that considerable time goes into thinking what to not to include in the apps even before I begin to make each app. For each algorithm I will carefully consider each step and how it would be best to implement, and whether the app or the student should do it. Teachers also send me good ideas about how to improve the apps. Some algorithm apps I have made in collaboration with the teacher who has requested the algorithm."