Question: what is a the prime factorization of 18?
Answer: 18 = 1 x 18, 2 x 9, or 3 x 6. Factors of 18: 1, 2, 3, 6, 9, 18. Prime factorization: 18 = 2 x 3 x 3, which can also be written 18 = 2 x 3². When 18 is a clue in the FIND THE FACTORS puzzles, use either 2 x 9 or 3 x 6.