GeoGebra applets

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...

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

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

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

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. $$-5\,+\,-7\,\,\mbox{ }-12\,+\,(+4)$$

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:

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