Goldbach's Conjecture vs Hexaflexagons

Fun and Challenging! Goldbach's Conjecture introduces students to an idea that has baffled mathematicians for centuries. In 1742, a Russian mathematician named Christian Goldbach wrote a letter to Leonhard Euler in which he proposed a conjecture. The conjecture stated that all even numbers greater than two can be expressed as the sum of two primes. This app challenges the player to find two prime numbers to make a target even number. Completing the activity involves using mental math skills. Goldbach Conjecture is designed to be a quick math exercise that teachers can use to provide extra practice in problem solving and an enriching experience for their students. Special sound effects make the game fun to use and the interactive design facilitate problem solving strategies.

Hexaflexagons are the ultimate paper puzzle, and this app helps you design and make them. What is a hexaflexagon, you ask? It's a paper puzzle that has a front side, a back side, plus hidden sides. It's fun to give them to your friends to see if they can find the hidden sides. Hexaflexagons are great for sending secret messages. Or as photo gifts. Or birthday cards. You can customize your own hexaflexagon or start from one of our designs. Please note that after a limited trial, a $3.99 unlimited use upgrade is required in order to have the app send you designs that you can print and fold at home.