Countdown Numbers Game (small numbers)

Choose 3 large numbers and 3 small numbers, and then choose a random target. How many ways can you find to use the small numbers plus some operations and brackets to make an expression that equals the target?

And start the clock when there are only 30 seconds left.

Broken Calculator

Your calculator is missing some of its keys! Which answers can you still get?
Six levels, from easy to challenging!

Translations on the Coordinate Plane

An interactive animation demonstrating how parallel vectors link a triangle and its translated image.
http://www.yenka.com/freecontent/item.action?quick=hd#

Sine and Cosine Graphs

A highly effective interactive animation illustrating the sine and cosine graphs formed by rotating a point around the unit circle.
http://www.yenka.com/freecontent/item.action?quick=je#

Scaling and Area

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#

Transformations of the Sine Curve

This interactive animation shows the effect of adding a constant to the function.
http://www.yenka.com/freecontent/item.action?quick=ji#

This interactive animation shows the effect of multiply the function by a constant a where a >= 0.
http://www.yenka.com/freecontent/item.action?quick=ot#

This interactive animation shows how altering b in the function
y = sin(bx) changes the frequency/wavelength.
http://www.yenka.com/freecontent/item.action?quick=ou#

The Steering Mechanism of a Go-Kart

A simple but clear interactive animation demonstrating how a parallelogram is formed from a rectangle.
http://www.yenka.com/freecontent/item.action?quick=di#

Cooking Potatoes

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#

Graphing Coordinate Points

A simple but effective tool for plotting points in the first quadrant.
http://www.yenka.com/freecontent/item.action?quick=nc#

An Equation Tool

Create and solve a linear equation by dragging the green circles up and down. The interactive graphics fill the whole screen so it is great for interactive whiteboards. Solutions must be natural numbers. From Yenka.com
http://www.yenka.com/freecontent/item.action?quick=lv#

These versions show if the equation is balanced or not, but the equation can't be changed.
http://www.yenka.com/freecontent/item.action?quick=lm#
http://www.yenka.com/freecontent/item.action?quick=ls#
http://www.yenka.com/freecontent/item.action?quick=lr#
http://www.yenka.com/freecontent/item.action?quick=ln#
http://www.yenka.com/freecontent/item.action?quick=lu#
http://www.yenka.com/freecontent/item.action?quick=lt#