List

OBMEP Problems and Solutions

Created in 2005 and run by IMPA, the Instituto de Matemática Pura e Aplicada, with funding from Brazil's ministries of education and of science and technology. Despite its name it is open to public and private schools alike, for pupils from the 6th grade to the end of high school, at three levels. A multiple-choice first phase is sat in the schools, and the best go on to a written second phase.

2025

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2024

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2023

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2022

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2019

Brazil

Phase 1
Level A1 problemAll problemsProblemSolution
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2018

Brazil

Phase 1
Level A1 problemAll problemsProblemSolution
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2017

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2016

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2015

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2014

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2013

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2012

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2011

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2010

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2009

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2008

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2007

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution

2006

Brazil

Phase 1
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution
Phase 2
Level 11 problemAll problemsProblemSolution
Level 21 problemAll problemsProblemSolution
Level 31 problemAll problemsProblemSolution