Decimal — AMC & AIME Problems
Practice every real AMC 8, AMC 10, AMC 12, and AIME problem that uses Decimal — a arithmetic 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
1987 AMC 8 Problem 1 • 1987 AMC 8 Problem 2 • 1987 AMC 8 Problem 5 • 1988 AMC 8 Problem 2 • 1988 AMC 8 Problem 6 • 1988 AMC 8 Problem 8 • 1989 AMC 8 Problem 2 • 1989 AMC 8 Problem 3 • 1990 AMC 8 Problem 2 • 1997 AMC 8 Problem 1 • 1997 AMC 8 Problem 3 • 1998 AMC 8 Problem 7 • 1999 AMC 8 Problem 3 • 2005 AMC 8 Problem 6 • 2023 AMC 8 Problem 3 • 2024 AMC 8 Problem 2 • 2024 AMC 8 Problem 10
AMC 10
2001 AMC 10 Problem 7 • 2004 AMC 10B Problem 13 • 2010 AMC 10A Problem 1 • 2020 AMC 10B Problem 12