Work backwards — AMC & AIME Problems
Practice every real AMC 8, AMC 10, AMC 12, and AIME problem that uses work backwards — a problem-solving techniques 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 of these problems are used with official legal permission of the Mathematical Association of America (MAA).
AMC 8
1987 AMC 8 Problem 15 · 1987 AMC 8 Problem 18 · 1990 AMC 8 Problem 21 · 1991 AMC 8 Problem 21 · 1996 AMC 8 Problem 12 · 1998 AMC 8 Problem 25 · 2002 AMC 8 Problem 25 · 2005 AMC 8 Problem 1 · 2005 AMC 8 Problem 24 · 2009 AMC 8 Problem 1 · 2010 AMC 8 Problem 21 · 2013 AMC 8 Problem 6 · 2020 AMC 8 Problem 22
AMC 10
2000 AMC 10 Problem 3 · 2002 AMC 10A Problem 6 · 2004 AMC 10B Problem 3 · 2009 AMC 10A Problem 8 · 2010 AMC 10A Problem 25 · 2011 AMC 10B Problem 2 · 2011 AMC 10B Problem 6 · 2012 AMC 10B Problem 11 · 2012 AMC 10B Problem 22 · 2013 AMC 10A Problem 21 · 2016 AMC 10A Problem 8 · 2017 AMC 10B Problem 1 · 2021 AMC 10B Spring Problem 9 · 2021 AMC 10A Fall Problem 2 · 2021 AMC 10A Fall Problem 23