Hightlight of the week
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2024/10/14 New official mock test from AOPS
2024/10/01 New problem set made by high quality contests created by wikjay, ijco, and megahertz13
2024/09/24 You can now do AMC mock tests with high quality contests created by AOPS community
2024/09/23 Video tutorial parent guide how to use the website
2024/09/23 We added 500 new questions to Math Trainer, you can practice all questions from the famouse CEMC (Waterloo, Canada) Math Contest
2024/09/14 New Math Trainer, you can practice your quest and your own practice problems
2024/09/05 New Berkeley Math tournament contests now available
2024/09/01 Start doing online contest and boost your contest rating. Congrats Yin Lam (1743), Emerio Diaziii (1682), John (1682),
Problem of the day
The length of a rectangle is 
inches and its width is less than 
inches. The rectangle is folded so that two
diagonally opposite vertices coincide. If the length of the crease is 
, then the width is:
Latest update
- 2024/08/28 Checkout new AMC 10 Counting Mock test 1
- 2024/08/18 Checkout Competify test 3 contest for grade 9-12
- 2024/08/18 Congratulations to BoredApe, Justin Kchao for a successfully Competify contest Test 2 (leaderboard)
- 2024/08/13 Checkout 100 new questions in AMC 8 Number Theory
- Take the brand new AMC 8 algebra test and earn reward
- Earn your reward by doing quest video tutorial.
- New challenge for 5-8 grade Competify challenge Set 2!!!.
- Trending lessions where top students are practicing.
- August 2024: Try our new AMC 10 courses version 2.
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