Prime numbers and factorizatio

Learn and practice with prime numbers, divisibility rules and fractionsLearn and practice:+ Prime and composite numbers+ Divisibility rules (2,3,5,7,11)+ Prime factorization => minimum common multiple and maximum common divisor+ Find prime numbers => Sieve of Erastothenes+ Lowest Common Multiple (L.C.M.) and Highest Common Factor (H.C.F.)+ Fractions: - add/subtract fractions - multiply fractions - divide fractions - compare fractions - simplify fractions