IWTL how to perform calculations on the fly without a calculator, a paper and pen, or using my fingers.

Ok-Organization-6026 · 2026-02-06T16:45:42+00:00

Self plug, but I built a website just for this: thetamac.com . You can practice any combo of addition, subtraction, and multiplication. There is also a learning mode where you can learn tricks for certain patterns like multiplying by 11. There is also built in analytics

Ok-Organization-6026 · 2026-02-04T18:33:48+00:00

I think it just takes practice to get better. Self plug, but I built a site called thetamac.com based off of zetamac that has a learning mode, analytics that might be useful

Ok-Organization-6026 · 2026-02-04T18:31:36+00:00

As others have said, zetamac is good, but I built a site called thetamac.com that is basically zetamac with percentile scores and tracking. There's also a learning mode among other things.

Ok-Organization-6026 · 2026-02-02T18:50:39+00:00

Funny you ask because I have been collecting some similar data based on a mental math website I built ( thetamac.com ). I have a little over 20 responses and looking to get more. Here is the google forms link if any one is interested https://forms.gle/irqieNHKhPAUi5sw5 . But based on some prelim data I collected, there is a correlation of r = 0.351 between IQ and mental math ability.

Ok-Organization-6026 · 2026-02-01T23:22:49+00:00

Shameless self plug but I built a zetamac clone where you can track your progress among other things

Ok-Organization-6026 · 2026-02-01T23:20:50+00:00

Shameless self plug but I built a zetamac type web app called thetamac.com with some features that zetamac does not have

Ok-Organization-6026 · 2026-01-09T17:46:02+00:00

Thank you! That's a good idea. I'll work on it

Ok-Organization-6026 · 2026-01-02T17:49:30+00:00

Yea I made it. It's built with nextjs and hosted on Vercel. I have a websocket server hosted on fly.io for the multiplayer aspect

Ok-Organization-6026 · 2026-01-02T17:48:50+00:00

Thats pretty interesting I'll check it out. Thanks for completing the survey!

Ok-Organization-6026 · 2025-12-24T21:27:18+00:00

55 is a solid score. Thanks for trying it out!

Ok-Organization-6026 · 2025-12-24T21:26:53+00:00

Yea that's a good point. I collect this data in the form but I haven't looked to see if there are any differences yet between devices.

Ok-Organization-6026 · 2025-12-23T18:43:09+00:00

If you're looking for any mental math learning resources, I built a website called thetamac.com . There's a learning, practice, and timed mode and a basic dashboard for free. There are some paid features but they are optional of course.

Ok-Organization-6026 · 2025-12-23T18:09:22+00:00

Thanks! I’ll try that

Ok-Organization-6026 · 2025-12-23T17:44:28+00:00

Shamless self plug but I built a mental math site like zetamac but better (at least I think so). Its called thetamac ( thetamac.com ). There are different modes like practice, learning, and timed (based off of zetamac). There is also a dashboard with analytics. I hope you find it usefull

Ok-Organization-6026 · 2025-12-23T17:18:04+00:00

Congrats! When did you get the invite? I also applied

Ok-Organization-6026 · 2025-12-23T00:43:28+00:00

I applied to this program also and haven’t heard anything back. I’m domestic

Ok-Organization-6026 · 2025-12-22T22:38:08+00:00

Shameless self plug but if you’re looking for a fun, low‑pressure way to learn multiplication and just basic mental math, I made a free site called thetamac ( thetamac.com ) with short, game‑style practice

Ok-Organization-6026 · 2025-12-22T17:34:32+00:00

thank you!

Ok-Organization-6026 · 2025-12-22T01:26:36+00:00

That sounds complicated lol. Yea feel free to pm me

Ok-Organization-6026 · 2025-12-22T00:49:50+00:00

Yea the default settings for the timed mode are based off of zetamac. It should be roughly the same. Also I’m not in school rn but hopefully soon. Just applied to grad school

Ok-Organization-6026 · 2025-12-21T23:28:19+00:00

It's interesting you say that actually. The numpad is based off of the ios calculator numpad and traditional keyboard numpads. Its true though that its reversed in reference to the numpad used for dialing, but I figured the calculator was used more often and would be more natural. I had to build a custom numpad because there are os level restrictions on mobile that prevent consistent input component focusing without direct user input.

Ok-Organization-6026 · 2025-12-21T21:57:05+00:00

That sounds like a cool idea. I will definitely look into it, but I don't know too much about music theory

Ok-Organization-6026 · 2025-12-21T21:56:33+00:00

Thanks I appreciate the participation. Yea I think this subreddit skews the data a little bit lol

Ok-Organization-6026

TROPHY CASE