# Number Virtual Manipulatives

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Space Blocks **New!**

Not got enough (or any) Multilink cubes for a whole class to play with or simply can’t be bothered with the hassle of giving them out and collecting them in? This virtual manipulative from NLVM is a great alternative. You can rotate and zoom to get a better view and the construction faces flash red where it thinks you want to place the new cube. Squares, cubes, roots is a great activity you could use these cubes with.

## Number Virtual Manipulatives

*'Great tools, freely available on the web for teaching Number!'*

The following page lists some examples of some of the best freely available virtual manipulatives on the web for teaching Number. Where possible they will link to an example of how they can be used in the classroom. Entries are listed by topic subheading, although it's not always easy to separate so it's worth looking through the lists!

### Negative Numbers

#### Negative Numbers

A fantastic series of self-help lessons from The Freudenthal Institute to guide students through negative numbers from representing on the number line and a witch adding and removing potions to a cauldron (negative numbers), to multiplying. A very complete set of lessons.

### Rounding and Estimation

#### The Infinitely Large and Small

Rounding to one million, ten million, or billions etc. can be confusing for students as they have little experience of objects that require such measures. The lesson "* Rounding: What For?*" uses this excellent, FREE, virtual manipulative from Florida State University to journey from the world of the infinitely large right down into the world(s) of the infinitely small!

#### The World of the Very Small

Similarly, rounding to one, two or three decimal places can be confusing for students for the same reasons - lack of experience of objects that require such numbers. The lesson Rounding: What For? makes use of this virtual world from www.cellsalive.com to examine the world of the very small.

### Properties of Numbers

#### Space Blocks

Not got enough (or any) Multilink cubes for a whole class to play with or simply can’t be bothered with the hassle of giving them out and collecting them in? This virtual manipulative from NLVM is a great alternative. You can rotate and zoom to get a better view and the construction faces flash red where it thinks you want to place the new cube. Squares, cubes, roots is a great activity you could use these cubes with.

### Indices/Exponents

#### Power Snap

This game of snap requires Flash. Cards are turned over and when two cards are the same we click on snap! This is a quick game that could be played to round off some work on index laws or as revision. The cards have power rules on them so students will need to recognise, for example, that .