Practice Online
Mental Math Practice Online
Train mental arithmetic with short timed sessions, focused operation drills, and a learning mode that shows practical shortcuts after you answer.
Ways to train
Timed drills
Build speed with short sprint sessions.
Learning mode
Review shortcuts and step-by-step explanations.
Competitive modes
Compare scores on leaderboards, race, or join a duel.
Pick a focus
Build a practice routine
A simple 10-minute session
- Warm up with medium mixed arithmetic for two minutes.
- Run one focused operation drill for six minutes.
- Finish with a two-minute benchmark and compare accuracy.
Interview prep routine
- Warm up for two minutes with medium addition and subtraction.
- Practice all operations under time pressure for five minutes.
- Review difficult patterns in Learning mode for three minutes.
Frequently asked questions
Read guides →What is thetamac?
thetamac is a free mental math training app for fast arithmetic practice—addition, subtraction, multiplication, and division—with timed drills, learning mode explanations, and competitive modes.
How do I practice mental math effectively?
Practice daily in short sessions. Start with a comfortable difficulty, focus on accuracy first, then add speed. Use timed drills for pacing, and learning mode to understand shortcuts and patterns.
Is this good for interviews (finance, consulting, analytics)?
Yes. Use timed mode for speed and pressure, and practice common operations you'll see in estimation and quick math. Track your accuracy and average time to make progress measurable.
Do I need an account?
No—guest mode works. Create an account if you want progress tracking across devices, saved settings, and access to advanced features.
What's the difference between Timed, Practice, and Learning?
Timed mode is a single session race against the clock. Practice mode gives a per-question timer for consistency. Learning mode slows things down and shows step-by-step explanations after you answer.
Can I customize difficulty and number ranges?
Yes. Use difficulty presets for quick setup, or enable custom ranges to choose your own minimum/maximum numbers per operation.