A fantastic implementation of the 'bath graph', ie the graph of water height vs time if a bath tap is turned on/off, and/or the plug is pulled out, and/or a person gets into/out of the bath. And a yellow duckie is included for free. Three thumbs up!

http://www.mathsonline.co.uk/nonmembers/gamesroom/sims/archi/archi4.html

Type in the Input. The Function Machine applies the function and produces the Output. If you choose [Random], you will have to use some brainpower to figure out the hidden function.
http://www.amblesideprimary.com/ambleweb/mentalmaths/functionmachines.ht...

Linear Function Machine
With this function machine, you have to enter the correct linear function, using algebra.
http://www.shodor.org/interactivate/activities/LinearFunctMachine/

A triangle is made up of four pieces. Move the pieces around to make a new congruent triangle. Except the new triangle is missing one square unit! Where did it go?

An interactive animation illustrating the sequence described by the nth term expression, 4n - 1, where n corresponds to the number of potatoes. Drag the potatoes into the microwave to see the time required to cook them. Click the arrow button to reset the animation.
http://www.yenka.com/freecontent/item.action?quick=mb#

Explore the graphs of functions interactively.
http://nlvm.usu.edu/en/nav/frames_asid_109_g_3_t_1.html?open=activities&...

Students use a TI-Nspire calculator to investigate coordinates of points and the gradients (slope) and equations of linear functions.
http://www.tialgebra.com/activities/algebra_i/335/

A TI-Nspire activity. In this activity, students investigate the total cost of a private party at each of three restaurants. Each restaurant states its pricing information differently, but all charge a flat room fee (represented by the y-intercept) plus a per guest plate fee (represented by the slope). Students model the cost of a party at each restaurant with the graph of a linear function.

Dinner Party Activity
http://education.ti.com/educationportal/activityexchange/download_file.j...

Type in the Input. The Function Machine applies the function and produces the Output. If you choose [Random], you will have to use some brainpower to figure out the hidden function.
http://www.amblesideprimary.com/ambleweb/mentalmaths/functionmachines.ht...

Linear Function Machine
With this function machine, you have to enter the correct linear function, using algebra.
http://www.shodor.org/interactivate/activities/LinearFunctMachine/

http://www.peterrussell.com/Odds/WorldClock.php
The World Clock website has continuously updated information about the world such as the world population, number of births, number of deaths, number of cars and the number of barrels of oil produced. It is a wonderful discussion starter for a number of maths topics including time series data and rates of change (gradient).

The World Clock is a one page flipchart that links to a website:
http://www.peterrussell.com/Odds/WorldClock.php

It continously updates information such as world population, births, deaths, number of cars produced, number of barrels of oil produced. A wonderful discussion starter for a number of maht topics including time series data and rates of change (regression).