Type in a length and a unit, and this website will convert your boring old unit to something much more interesting, eg 200 cm converts to 39 AA batteries end to end, or 10 five month old human fetuses end to end or even 1.4 standard railway gauges. Fun and educational. Three thumbs up!

http://www.sensibleunits.com/

The students use the concept of triangulation to locate Digit.
http://pbskids.org/cyberchase/games/circles/

Students have to estimate the angles needed to shoot each of the planets.
http://pbskids.org/cyberchase/games/anglemeasurement/

A simple but effective interactive animation showing the relationship between enlargement and area. Choose a scale factor from two to ten then click the arrow button to enlarge the square.
http://www.yenka.com/freecontent/item.action?quick=i9#

The presented problems ask you to change the time on the right clock. Click Check Answers to see if your answer is correct. Then, click New Problem for start a new problem.
http://nlvm.usu.edu/en/nav/frames_asid_318_g_3_t_4.html?open=instruction...

Tangrams are a versatile manipulative. They can be used to build understanding of geometry, fractions, area and other topics. This is a Java implementation of tangrams.
http://nlvm.usu.edu/en/nav/frames_asid_268_g_1_t_3.html?open=activities&...

A large interactive analog clock face, designed to assist in teaching students to tell time using an analog clock. From Ambleside Primary.
http://www.amblesideprimary.com/ambleweb/mentalmaths/clock.html

A flash program that displays a large clock that keeps time via the system clock. A very handy utility for both teaching about time, and as a classroom management tool.
Web address:
http://www.wmnet.org.uk/wmnet/custom/files_uploaded/uploaded_resources/5...