Simple on the surface, deep enough to keep you coming back.
Addition, subtraction, multiplication, division, percentages, and squares — each in its own focused drill.
From Easy warm-ups to Expert problems that reward real mental technique. Grow into the next level at your pace.
A consistent 100-question benchmark of mixed operations — one clear number for your speed and accuracy over time.
Charts for every exercise, a daily streak with records to chase, and a home-screen widget that keeps you honest.
Short articles teach the mental moves behind fast arithmetic — from the ×11 pattern to squaring anything near a round number.
No account, no sign-up. Your practice history stays on your device — see the privacy policy.
Available in English, French, German, Hindi, Russian, Spanish, Thai, Turkish, Ukrainian, and Vietnamese.