Showing 141–160 of 1,000 ranked alternatives.
Masuo Yoshida
Solve puzzles quickly
Practice one- with 81 randomized questions from 1x1 to 9x9. Answer in a timed format to improve speed and accuracy. Choose from four difficulty modes: ascend, descend, random, or random random. View correct answers and track progress.
Greg Deterding
Recite pi, track progress, challenge others
Learn and memorize the digits of pi with interactive training sessions. Practice reciting pi in increments, set personal goals, and track progress over time. Access a vast database of pi digits for unlimited practice.
DAI WEIJIE
Calculate in multiple number systems
Perform calculations with binary, octal, decimal, and hexadecimal values displayed simultaneously. Enter and view hex codes and RGB values on the same screen. Display up to 19 decimal digits. Toggle conversion reset on or off.
衍旋 廖
Play and solve
Solve with varying difficulty levels. Input numbers into grids following rules. Track progress and complete daily challenges. Access unlimited for brain training.
Horizon Business, Inc.
Practice with multi-digit problems
Practice long with problems ranging from 1 to 5 digits in the top factor and 1 to 3 digits in the bottom factor. Solve random or custom entered problems. View step-by-step solutions with adjustable tutorial animation speed.
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