Mental Math Trainer - Online Timed Arithmetic
Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
UD5 Toolkit
Sharpen your arithmetic skills with timed drills
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Solve random arithmetic problems under a time limit. Track your score and improve mental calculation. No data collected.
Practice times tables with interactive flashcards and a countdown timer. Choose specific numbers to drill, track your score, and improve mental math speed.
Generate a sheet of random arithmetic problems (+, -, ×, ÷) with configurable digits. For kids and brain training.
Complete a 10x10 multiplication grid against the clock. A fun way to master times tables.
Click cells to see patterns, highlight multiples. Visual way to learn multiplication. Print empty grid.
Test how fast you can convert between binary and decimal. Timed drills with increasing difficulty. Learn base‑2 fluency.
Answer as many mental math problems as you can in 60 seconds. Choose operation, difficulty, and track your best score over time.
Drag pie slices to represent fractions and see them added together. Great for visual learners.
Enter number of eyelet pairs and lacing style to find the correct shoelace length in inches/cm. Never buy too short.
Use your phone's gyroscope to practice holding a knife at exactly 20° on a flat stone. Build muscle memory for field sharpening.
A random letter appears; you must select the correct semaphore position from 4 choices. Scouts & maritime.
Randomly prompts you to press a Windows keyboard shortcut (e.g., Win+E). Learn to be a power user.
Practice carrom shots on a virtual board. Visualize rebounds and plan your strike on the physical board.
Paste text and set display speed for Rapid Serial Visual Presentation. Train your reading speed.
Select a tool (VS Code, Figma, etc.) and get random shortcut prompts. Press the keys to practice.
Random letters appear; you must type the correct code word quickly. Beat your high score. Learn the NATO alphabet.
Flashcards for learning Braille. See the dot pattern and type the letter. Track your speed and accuracy. Accessibility education.
A sequence of digits flashes for a few seconds. Type it back. Increase length. Improve your working memory.
Enter two Roman numerals and add or subtract them. See the result in Roman and Arabic. A fun mental workout.
Practice sending Morse code using a virtual straight key. Visual feedback and audio tone. Learn timing and proper fist.
A random note appears on the grand staff; click the correct piano key. Improve sheet music reading. Multiple clefs.
A random note name appears; click the correct position on the bass fretboard. Beat your time and accuracy.
See a random letter/number and tap the Morse sequence. Instant feedback. Practice the full international Morse alphabet.