Question: what is a common factor between 14 and 18?
Answer: Find the highest common factor (H.C.F) of 14 and 18. Factors of 14 = 1, 2, 7 and 14. Factors of 18 = 1, 2, 3, 6, 9 and 18. Therefore, common factor of 14 and 18 = 1 and 2.