**1. Stock the Shelves**

http://www.mrnussbaum.com/stockshelves.htm

Maths topic: __Coordinate Plane, Graphing__

- The objective is to put the soda bottles in their correct places on the coordinate plane.
- Pupils can learn to read coordinates (in the Cartesian plane) with this activity.
- Alternatively, it can be used for reinforcement and practice.

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**2. Algebra vs Cockroaches**

http://hotmath.com/hotmath_help/games/kp/kp_hotmath_sound.swf

Maths topic: __Algebra, Graphs__ (Secondary)

- The objective is to kill the cockroaches that run across the grid. To do that, pupils enter the equation.
- In Round 1: The activity can be used to
__introduce__terms like y-intercept – as the first part requires pupils to able to read the y-intercepts of lines - In Round 2: Linear equations passing through the origin are
__introduced__. Pupils learn how to find gradient of a straight line. However, it’s only limited to positive gradients; however, gradients could be whole numbers or fractions. - In Round 3: Pupils
__apply__and combine what they learnt in rounds 1 & 2 to write down equations of straight lines. - Alternatively, the activity can serve as a
__practice__.

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**3. Planarity**

http://www.planarity.net/#

Topic: Graph Theory [Upper Secondary/JC]

- More reading: http://en.wikipedia.org/wiki/Planar_graph