The local readers club has a set of 64 hardback books and a set 24 paperbacks. Each set can be divided equally among the club members. What is the greatest possible number of club members?
You need to find the highest common factor of 24 and 64
Break down these numbers to their lowest prime numbers:
64 = 2x 2 x 2 x 2 x 2 x 2
24 = 2 x 2 x 2 x 3
Take the common factors found in BOTH 2 x 2 x 2 = 8 is your answer
