# Math

## Get OnBoard with our free lessons!

Welcome to OnBoard, our free email service that provides you with loads of the highest quality teaching material for your interactive whiteboard and your classroom.

**Why get OnBoard?**

Find great free lessons for your math teaching in one place, **saving you hours.**

- Free animations, flexible graphs and diagrams, and quizzes
- Free lesson plans
- Free posters
- Free PowerPoint material, and MUCH MORE!

Just **download our latest free content below to GET OnBoard TODAY**! You can also scroll down for an archive of all the free lessons we've given away.

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## Free animation on constructing the incenter of a triangle!

This animation demonstrates how to find the incenter of a triangle using a compass, ruler and pencil, involving constructing angle bisectors. It also asks your students to consider how the incenters of obtuse and acute triangles could be different.

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## Order a free sample disc!

Why not click here to order a free sample disc? With dozens more exciting activities to try out, the sample disc shows you how Boardworks can transform teaching and learning in your classroom.

**Having trouble using our free lessons? Click here for some easy solutions.**

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## Free animation on completing the square

This free activity shows your students **how the formula for completing the square is derived, with the help of a geometric diagram**.

Take your students through the process for a quadratic expression with our easy to follow, step by step activity.

If you’re encountering a problem when you’re downloading our free resources, one of the most common reasons is that you don’t have an up-to-date version of Adobe Flash. Update your version of Flash now for free – just click here.

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## Limitless practice for factoring quadratics: free activity

Use our **random quadratic expression generator** to produce an endless series of fresh equations for your class to practice with.

This activity will provide your students with **valuable practice in factoring quadratic expressions** in the form * ax² + bx + c*, including where a is negative. It presents a quadratic expression to factor, the answer to which is provided but covered. Students can then attempt to solve it themselves and can quickly see if they were correct.

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## Free presentation on cones!

The animations in this presentation will walk your class through how they can calculate the surface areas and **volumes of cones and frustums**.

They can then **put these calculations into practice** as the presentation walks them through three real life examples and challenges them to apply what they have learned.

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## Free worksheet on matching perpendicular lines!

Use this **engaging mathematical practice sheet** to help your students understand the equations of straight lines by finding values using their function, and working out a function using its values.