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Math Fair Category: Number Operations

Hot Potato

There is a werewolf hiding in a red hood and 11 children sitting around a campfire. Katrina, who is sitting opposite the werewolf, plucks a…

Hello Alien!

How many extraterrestrial civilizations are there in our galaxy with which we might communicate? Dr. Drake split the problem into 7 smaller problems: How many…

Grasshopper Jump Fest

One of the sports that grasshoppers play when they are by themselves is the jump-fest. To play, a number of grasshoppers stand on a tire…

Froggy Hopscotch

Hopscotch was originally a training exercise for Roman infantry. These frogs don’t know that history. They are just interested in jumping about on their lily…

Frog Catchers

This is a game for two frog catchers. There are a bunch of frogs to catch and one special frog. You and a friend are…

Factorial Abacus

This problem is best for people who can express numbers in different bases. An abacus is a mechanical device for temporarily storing numbers during a…

Egyptian Fractions

The Egyptians only used fractions with a numerator of 1.* Take the fraction 80/100 and keep subtracting the largest possible Egyptian fraction till you get…

Double Dozen

Equipment: A deck of playing cards with Aces = 1 and the Jacks, Queens, Kings and Jokers left to one side. Number of Players: 2-6…

Die Hard

In the movie Die Hard, 4L of water must be weighed, and if incorrect, the fountain from which the water is drawn will explode, killing…