Factor — AMC & AIME Problems
Practice every real AMC 8, AMC 10, AMC 12, and AIME problem that uses Factor — a number theory concept — each with a professionally curated solution, many with a video solution too, from LIVE by Po-Shen Loh. Browse all concepts or the full past-contest archive.
All problems are used with official legal permission of the Mathematical Association of America (MAA).
Filter by difficulty
These problems’ difficulty ratings come from real solve attempts on our platform. Tap a band or a contest to filter the list below, and tap a selected band again to include all difficulties. See the full difficulty guide.
AMC 8
1988 AMC 8 Problem 14 • 1990 AMC 8 Problem 22 • 1994 AMC 8 Problem 10 • 1995 AMC 8 Problem 12 • 1995 AMC 8 Problem 22 • 1996 AMC 8 Problem 1 • 2001 AMC 8 Problem 2 • 2006 AMC 8 Problem 10 • 2017 AMC 8 Problem 23 • 2022 AMC 8 Problem 3
AMC 10
2003 AMC 10A Problem 8 • 2005 AMC 10A Problem 21 • 2014 AMC 10A Problem 21 • 2014 AMC 10B Problem 12 • 2018 AMC 10B Problem 21 • 2021 AMC 10B Spring Problem 5 • 2022 AMC 10B Problem 7 • 2023 AMC 10A Problem 23 • 2024 AMC 10A Problem 7 • 2024 AMC 10B Problem 6
AMC 12
1960 AMC 12 Problem 31 • 1961 AMC 12 Problem 33 • 1962 AMC 12 Problem 38 • 1973 AMC 12 Problem 21 • 1975 AMC 12 Problem 22 • 1984 AMC 12 Problem 21 • 2002 AMC 12A Problem 20 • 2008 AMC 12B Problem 16 • 2011 AMC 12B Problem 15 • 2013 AMC 12A Problem 10 • 2014 AMC 12B Problem 7 • 2019 AMC 12B Problem 14 • 2020 AMC 12B Problem 24 • 2022 AMC 12B Problem 4 • 2023 AMC 12B Problem 14 • 2024 AMC 12A Problem 6 • 2024 AMC 12A Problem 12