Hands-On Math: Interactive Hundreds Chart creates a virtual math playground where students explore, investigate and discover mathematical concepts. Students use colored markers on the Interactive Hundreds Chart to represent patterns and number sequences. Using Hands-On Math: Interactive Hundreds Chart students can develop the following important mathematical concepts: Skip-Counting Number Patterns Multiplication and Division Facts Prime and Composite Numbers Least Common Multiple Divisibility of Numbers and more... An extensive Instructor's Guide for this app is available at the support website. Download the document and install it in iBooks to access ideas about how to use the Interactive Hundreds Chart for teaching elementary mathematics. Extremely easy for students and teachers to use. Tap a color and a marker, then tap numbers on the chart. To remove a marker simply slide it off the chart. Erase all markers by tapping the eraser. Note to reviewer: Simply slide a marker off the board to remove it. There is no need to erase entire board if you make a mistake.