GeoGebra applets

## Angles in Polygons

Use this applet to investigate the sum of angles in polygons. Is there a pattern? Can you predict the sum of the angles in a 20-sided polygon?

Use the applet...

## Finding π Experimentally

Students measure the circumference and diameter of several different circles in order to find a good estimation for π.

## Converting between improper fractions and mixed numbers

Mixed numbers can be converted into improper fractions and vice versa. Learn how here. $$3\frac{2}{5}\,=\,\frac{17}{5}\,\,\,\mbox{and}\,\,\,\frac{13}{7}\,=\,1\frac{6}{7}$$

## Arrange fractions from least to greatest

Comparing several improper fractions and arranging them from least to greatest. $$\frac{15}{4}\,\,\,\,\,\frac{17}{6}\,\,\,\,\,\frac{11}{2}\,\,\,\,\,\frac{7}{3}$$

## Solving proportion word problems

Learn how to solve proportion word problems. Sample problem here.

## Three ways to solve proportions

There are many ways to solve a proportion. This page shows you three methods. $$\frac{6}{9}\,=\,\frac{x}{12}$$

Learn how to add positive and negative integers. $$-5\,+\,-7\,\,\mbox{ }-12\,+\,(+4)$$

## Comparing and locating integers

Integers are a lot like the whole numbers that you already know.  The main difference is that there are negative integers as well as positive integers.  Zero is also an integer, but it is neither positive nor negative.  Here is one way we can picture the set of integers:

## Arrange fractions, decimals, and percents from least to greatest

This applet provides practice for sorting a set of fractions, decimals, and percents in order from least to greatest.

## Locating decimals on a number line

Practice locating decimals on a number line.