r/CasualMath
17k members
r/CasualMath is a subreddit with 17k members. The most common kinds of discussions are advice requests and pain & anger, and the community frequently discusses math, algebra, puzzle, help, and geometry.
This is a subreddit that is meant to be somewhere inbetween /r/math and /r/learnmath.
Popular Themes in r/CasualMath
#1
Advice Requests
: "Can somebody explain how to do this? "
21 posts
#2
Pain & Anger
: "I think I made a mistake"
6 posts
#3
Solution Requests
: "What App/Web do y'all use for UG step by step solutions?
"
4 posts
#4
Ideas
: "I made a new number system. Just gonna leave it here."
2 posts
#5
News
: "Can Math Help Repair Democracy? | Sam Wang | TED - From detecting gerrymandered districts to predicting the impact of alternative election methods like ranked-choice voting, Sam Wang outlines how computer simulations can help fix the bugs in US democracy and make it more responsive to the people."
1 post
Popular Topics in r/CasualMath
#1
Math
: "These are some of my favorite Math books. Which of these or any other Math books do you think are the best? Zero is one of my favorites."
81 posts
#2
Algebra
: "Can you find the mistake here?"
29 posts
#3
Puzzle
: "Hello fellow Puzzle enthusiasts! I recently picked up a math Puzzle book from Amazon called Subtradd, featuring a game type called Target. It's been a blast for a math lover like me, but I've only scratched the surface. Could you guys help me with the rest. Thanks a lot!"
24 posts
#4
Help
: "(Summation) Need Help deciphering my Brazilian Jiu Jitsu (BJJ) Gi"
18 posts
#5
Geometry
: "An interesting Geometry problem with a simple solution "
16 posts
#6
Question
: "This Question has me stumped, im stuck between option b and c, which option is correct, and what would the others be? (for example, if c is correct, then explain how the elevator would move so that a is the correct answer)"
10 posts
#7
Proof
: "New Proof (as far as I'm aware) 0.999... = 1"
8 posts
#8
Probability
: "A quick Probability problem for anyone interested"
7 posts
#9
Solve
: "Is there a way to Solve this question without trigonometry?"
6 posts
#10
Trigonometry
: "I found this Trigonometry question in my old book."
5 posts
Member Growth in r/CasualMath
Yearly
+1k members(9.6%)
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Last updated: June 22, 2026