Arithmetic

• Algorithms and Ice Cream for All (MegaMath): A puzzle that pushes the limits of a computer's ability to solve problems.
  
  
• Brain Teasers: Math puzzles for grades 3-4, 5-6, and 7+.
  
  
• Electronic Games for Education in Math and Science (E-GEMS): The aim of this research is to increase the proportion of children in Grades 4-8 who enjoy learning, mastering, and using underlying concepts of math and science.
  
  
• Facts About Prime Numbers: Twin primes; Primes in arithmetic progression; Fermat numbers and primes; Repunits; How many primes are there? From Number World.
  

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