Animal See-Saw is a game for two players.
Each player is given 12 animals.
Players take it in turns to place an animal on their side of the see-saw - making sure that their side of the see-saw is never more than 5 kg heavier than the other side.
The winner is the player who survives the game without ever being more than 5kg heavier than his/her opponent.
If a player does become 5kg heavier than their opponent, the see saw falls, they lose and the game is over.
If both players make it to the end of the game, the winner is the one with the most weight on his/her side.
The Magic Golpher will guess your number. How does it do it?
Can you solve 20 subtraction facts in 60 seconds?
Can you solve 20 addition questions in 60 seconds?
Help the missionaries and cannibals cross a river. The rowboat holds a maximum of two persons at a time. Beware: If the cannibals outnumber the missionaries on either bank, the missionaries will be eaten up.
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.
Linear Function Machine
Use logic (ie your BRAIN) to drop the ball over the correct tools in the correct order.
A flipchart on the vertex form of a quadratic function and its graph.
You are given a circle of radius 1 unit and two circles of radius a and b which touch each other and also touch the unit circle. Prove that you can always draw a 'flower' with six petals with the unit circle in the middle, and six circles around it having radii
Join together cogs of different sizes and investigate what happens when you turn them. From the NRich website.