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Website review by Paul Cancellieri, Common Sense Education | Updated May 2013
National Library Of Virtual Manipulatives

National Library of Virtual Manipulatives

Novel concept could deliver even more learning with better interactivity

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Based on 10 reviews
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Subjects & Skills
Math, Critical Thinking, Character & SEL

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Pros: Simple to use and free of charge, with virtual manipulatives for almost any topic and grade level.

Cons: Not so easy on the eyes, and won't play nice with iPads, iPhones, or iPod touches.

Bottom Line: Students who struggle with difficult math concepts may like the trial-and-error format, but the vintage design and unclear feedback may scare some away.

Asking students to explore new concepts with these virtual manipulatives can be great when combined with a lecture or reading activity. Afterwards, it can be powerful to bring the class together, look at the virtual manipulative again, and have them reflect on what they've learned. Also, these manipulatives could be assigned as homework, or as a supplement to traditional practice problems. Parents may find it helpful to be able to "play" with these tools alongside their child. While the site doesn’t give many specifics to teachers, there are lots of potential uses here. Teaching algebraic thinking to elementary school students? Just display one of the interactive games or demonstrations on the board, or let students explore it on a laptop with just some simple instructions. Even in small groups, these tools are engaging and effective.

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Editor's Note: While the National Library of Virtual Manipulatives is still available but the manipulatives require outdated Java software that's incompatible with most web browsers.

Dating back to 1999, the National Library of Virtual Manipulatives (NVLM) is a collection of Java-based interactive tools that teach math concepts. While some of the concepts can be quite complex, most of the tools have a very simple (and dated) appearance. However, they'll run on any Java-capable browser (not on Apple's mobile devices). On the site's home page, users find a Virtual Library containing tools under the following categories: Numbers and Operations, Algebra, Geometry, Measurement, Data Analysis and Probability. Each category is divided into resources for different grade levels, from Pre-K through 12th grade.

The idea alone of a library of manipulatives like this is a novel concept; after almost 15 years in the making, the site still has a lot of potential. However, an update –- not only to design but usability –- would be a great way to make this site accessible to more kids. That said, given the tools' exploratory nature, the site can be great for allowing students to discover math concepts on their own. By experimenting, students are often more successful in building deeper understanding, and even though the site gives little in the way of direction, it can be great when used in this way.

If using these tools to support specific parts of your curriculum, you'd be wise to help students along; either direct them toward areas of focus, or give them some context by showing them examples beforehand. Because not all the manipulatives give kid-friendly feedback, the site would do well to build in some better interactivity. Also, for your visual learners, the NVLM can be great for helping kids see and understand abstract concepts like variables and statistical probability.

Overall Rating


Kids will like the visual nature of these interactive tools, but the appeal may be limited by their stripped-down, "old school" look.


Kids enter numbers and adjust variables to see the outcome on graphs and visual displays. By experimenting, kids can learn through experience. When paired with reflection, this can become a powerful learning opportunity.


The site doesn't give many descriptions or explanations, but the interactives are designed to be used primarily by teachers or with the guidance of a teacher.

Common Sense reviewer
Paul Cancellieri Classroom teacher

Community Rating

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Featured review by
Susan W. , Classroom teacher
Classroom teacher
So many tools on this site that help integrate classroom lessons and engage students for independent learning.
This is one of my "GOTO" sites for my Pre Algebra and Algebra classes. Once I have done whole class instruction using the book. I them move onto in class manipulatives. There are still some students that can not grasp the concept. NLVM is my next step. The Algebra Balance Scales and Algebra Tiles seems to be able to help those last students that still need some additional instruction.
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