Units digit — AMC & AIME Problems
Practice every real AMC 8, AMC 10, AMC 12, and AIME problem that uses Units digit — 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).
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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
1986 AMC 8 Problem 8 • 1990 AMC 8 Problem 4 • 1994 AMC 8 Problem 6 • 1996 AMC 8 Problem 15 • 1997 AMC 8 Problem 25 • 1999 AMC 8 Problem 24 • 2000 AMC 8 Problem 14 • 2012 AMC 8 Problem 12 • 2022 AMC 8 Problem 17 • 2024 AMC 8 Problem 1
AMC 10
2000 AMC 10 Problem 6 • 2003 AMC 10A Problem 16 • 2005 AMC 10A Problem 16 • 2008 AMC 10A Problem 24 • 2015 AMC 10B Problem 10 • 2018 AMC 10A Problem 19 • 2023 AMC 10B Problem 8 • 2024 AMC 10B Problem 8 • 2025 AMC 10B Problem 2