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 of these problems are used with official legal permission of the Mathematical Association of America (MAA).
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