Training
Practice mental math at your own pace
Go for volume. Your best single session counts for leaderboards (default settings).
Mental math training for fast arithmetic practice
Build speed and accuracy with daily drills. Useful for school, everyday calculations, and fast-paced work like finance and consulting interviews.
Timed drills
Sprint sessions for speed under pressure
Learning mode
Step-by-step explanations and techniques
Competitive modes
Duels, racing, and global leaderboards
How it works
- Pick a mode above (Timed, Practice, or Learning)
- Choose operations and difficulty
- Train for a few minutes daily
Interview prep routine
- 2 min warm-up (Medium, +/−)
- 5 min timed (Medium→Hard, all ops)
- 3 min review in Learning mode
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.