This file contains 12 links with screen shots of some great nlvm puzzles and brain teasers.
The website nlvm.usu.edu “national library of virtual manipulatives” is a collection of interactive math activities that allow students to visually examine, explore and develop mathematical concepts from the Common Core Math Standards. These virtual manipulatives can be used in a whole class setting, in small groups, individually in a computer lab, or at home for those students who have internet access. The lab sheets guide the students' exploration of the virtual manipulatives and help keep them focused and accountable.
I’ve also developed lab sheets for some of the activities to guide students’ exploration and to keep them focused and accountable. Check ‘em out at my TpT store.
The nlvm.usu.edu website requires a java plugin (free download online) for Mac and Windows computers. These applets will not run on ipads or android tablets -- sorry.