Hey! As you all study up math in preparation for the next MathForces round, would love to share some subject-based problem sets compiled from old competitions that you may enjoy. Each of these was chosen because they were either nice or educational. They each have a difficulty rating — if there are any you find uninteresting, I'd recommend trying ones of a higher difficulty!
The fun part about these is you can do them in a competitive setting against a lot of other contestants, with a rating :)
Hope you enjoy! (Higher difficulty rating means harder)
Algebra Set 1 #1 (800)
Algebra Set 1 #2 (800)
Algebra Set 1 #3 (1200)
Algebra Set 1 #4 (1200)
Algebra Set 1 #5 (1200)
Algebra Set 1 #6 (1300)
Algebra Set 1 #7 (1400)
Algebra Set 1 #8 (1300)
Algebra Set 1 #9 (1400)
Algebra Set 1 #10 (1400)
Algebra Set 1 #11 (1400)
Algebra Set 1 #12 (1400)
Algebra Set 1 #13 (1400)
Algebra Set 2 #1 (800)
Algebra Set 2 #2 (1200)
Algebra Set 2 #3 (1200)
Algebra Set 2 #4 (1400)
Algebra Set 2 #5 (1600)
Algebra Set 2 #6 (1600)
Algebra Set 2 #7 (1600)
Algebra Set 2 #8 (1700)
Algebra Set 2 #9 (1700)
Algebra Set 2 #10 (1800)
Algebra Set 2 #11 (1800)
Algebra Set 2 #12 (1800)
Algebra Set 2 #13 (1600)
Algebra Set 2 #14 (1800)
Algebra Set 2 #15 (1800)
Algebra Set 2 #16 (1800)
Algebra Set 2 #17 (1900)
Algebra Set 2 #18 (2000)
Geometry Set 1 — #1 (1400)
Geometry Set 1 — #10 (2300)
Geometry Set 1 — #2 (1400)
Geometry Set 1 — #3 (1600)
Geometry Set 1 — #4 (1600)
Geometry Set 1 — #5 (1600)
Geometry Set 1 — #6 (1600)
Geometry Set 1 — #7 (1600)
Geometry Set 1 — #8 (1700)
Geometry Set 1 — #9 (2000)
Number Theory Set 1 #1 (1200)
Number Theory Set 1 #2 (1200)
Number Theory Set 1 #3 (1300)
Number Theory Set 1 #4 (1400)
Number Theory Set 1 #5 (1600)
Number Theory Set 1 #6 (1600)
Number Theory Set 1 #7 (1600)
Number Theory Set 1 #8 (1400)
Number Theory Set 1 #9 (1700)
Number Theory Set 1 #10 (1700)
Number Theory Set 1 #11 (1700)
Number Theory Set 1 #12 (1800)
Number Theory Set 1 #13 (1800)
Number Theory Set 1 #14 (1800)
Number Theory Set 1 #15 (2000)
Number Theory Set 1 #16 (2000)
Number Theory Set 1 #17 (2100)
Number Theory Set 1 #18 (2300)
Number Theory Set 1 #19 (2500)
wheres combinatorics :(
I made a prior blog post about Combinatorics Practice Contests — Combinatorics Practice Collection, hence including everything else here :)
Hope you enjoy!
thanks
Great!
Do editorials exist for these problems?
Most of them have solutions linked post-contest, and for those that don't, there is an 'ask for help' button to get solutions from authors and other contestants!
Hi mathforcers! I want to solidify my math foundation from the very basics. Because I think about problems in a brute force way instead of thinking mathematically. This is the reason I get TLE on problems (1200+ rated). Considering that I don't have a good math background, What would be some valuable tips for me? I was thinking to just go through the NCERT math books from Class 9 to 12 (mostly focussing on algebra, number theory and geometry topics. Your advice will be valuable.