• Clockwise
A clock face is shown and the user enters the digital time. Three difficulty levels.

• Cubes
An excellent interactive applet that illustrates the volume of a rectangular prism (box). Units of single cubes, rows of cubes, or layers of cubes can be used to fill a prism.

• FunBrain.com
The FunBrain website that contains many games includes some that find area and perimeter of shapes.

• Geoboard
This electronic geoboard measures the area and perimeter of any shape made. What is nice is that the measures are not shown until the user clicks the Measure button. Students can be challenged to make shapes with specified areas and/or perimeters.

• How High?
Two cylinders are shown along with the area of the base shown as a grid of squares. One cylinder is filled to a specified height. The task is to determine the height of this same liquid when it is poured into the second container.

• Image Tool
The user can measure angles, distances, and areas in several different images (choices include maps, aerial photos, and others). A scale feature allows the user to set the scale used for measuring distances and areas. Unique!

• Lake and Island board
This page is a comprehensive group of activities using measurement in a unit with children to create a "lake and island board." The activities even provide data for students to work with in the different daily activities.

• Match Clocks
The user matches either a digital time to an analog or the reverse. Problems are posed randomly and there are no controls for difficulty.

• MathCentral
This site includes many activities for elementary students dealing with time, temperature, and money. Many of the lessons include children's literature selections.

• Math Forum
As part of the Math Forum site, this page deals directly with children's commonly asked questions surrounding measurement issues. The site also provides a good list of terms, which could be a beneficial resource for students during a measurement unit.

• PBS Mathline
As part of PBS's Mathline program, this site provides excellent lessons and materials for a primary unit on measurement. Once on the main page, there is a link to a PDF document that provides everything you would need for the unit.

• Perimeter Explorer
The user sets a fixed number of square units, and the applet randomly creates shapes on a grid with this area. The object is to determine the perimeter. There is also an Area Explorer (fixes the perimeter) and a Shape Explorer, which asks the user for both the area and perimeter of the randomly produced shapes.

• Pi Day
This site, a part of the Math Forum website, will provide you with some activities to use on Pi Day (March 14th or 3.14...)

• ProTeacher.com
This page provides many links to lesson plans on many concepts within measurement, including clocks, coins, estimating measurements, and more. Many of the links provide lesson plans with printable activity sheets.

• Turtle Pond
In this activity the user enters distance and angle commands in a sequence (like Logo) to maneuver a turtle to a pond. Helps with distance and angle estimation.

• What Time Will It Be?
Elapsed-time problems are presented in word format. Two clocks are shown, one with the start time and the other to be set. Some problems are digital, others analog.