Our district has explorelearning.com. This is an awesome website that has interactive gizmos that students can manipulate. There are math and science gizmos. Each gizmo has worksheets and a quiz that can be used. You can download the worksheets and modify them as needed. Once you modify the worksheet to meet your needs then you can upload your worksheet to the site for other teachers to use. There is an app for this site and they are currently working on transitioning all the gizmos over so they can be used on an ipad. I highly recommend this site! The students will love it!