National Internet Math Olympiad
The National Internet Math Olympiad (NIMO) is a team-based series of online math tests for high school students. It is organized by Evan Chen.
Online Math Open
The Online Math Open (OMO) is a math Olympiad held in fall and spring. There are 30 questions (each worth 1 point), and each answer is a nonnegative integer less than or equal to . The test lasts for 12 days. The only electronic math tool allowed is a four-function calculator.
NIMO Summer Contest
The NIMO Summer Contest is another online contest where each question is worth the respective question’s number points. Solvers can not return to a problem when a problem is skipped.
NIMO Monthly Contest
The NIMO Monthly Contest has 8 questions that must be solved in 40 minutes. Solvers can submit up to 3 attempts.
As of 2018, the NIMO Monthly Contest has been discontinued.