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Practice mental math with flashing numbers, adjustable speed and mistake review.
Practice mental math by adding numbers as they flash on screen. Remember each number, work out the total and enter your answer. Flash lets you set the pace for quick addition practice or a longer mental arithmetic session. Choose your challenge • Numbers with 1–7 digits • 2–500 numbers per question • Display speed from 0.1 to 3 seconds • 1–999 questions or unlimited practice • Optional answer input and automatic progression Learn from each session Check your accuracy, response time, correct-answer streak and total practice time. Review the numbers in each question and try your mistakes again. Save your favorite settings Create presets for the digit count, speed and other settings you use often. Adjust the background, text color, sound and vibration feedback to suit your practice. Build a regular addition practice routine on your phone or tablet, one short session at a time.