WeekdayWidget vs Crash Math Academy

Want to learn the ‘Human Calendar’ trick and quickly calculate the day of the week for any calendar date in your head? WeekdayWidget is the definitive platform for learning, training, and performing mental weekday calculation. It has never been easier to learn this skill- in addition to the comprehensive text and video tutorials, WeekdayWidget features an exclusive ‘Guided Solve’ mode that walks you step by step through the full process until you’re ready to solve on your own! The app also features: - Sleek user interface with unlockable themes - Training minigames for practicing individual steps in the full process - Speedrun mode based on official Memoriad categories - Text-to-speech functionality to emulate spoken performances - Fully customizable date range from 1600 - 2100 …and more! Whether you’re learning for a mathematics demonstration, training for Mental Olympics competition, or just picking up a neat party trick, WeekdayWidget’s flexibility makes it the ideal platform no matter the use case. ‘Doomsday’ algorithm inventor John Conway was famously able to calculate any weekday in under two seconds… Can you beat that?

You signed up for the crash reconstruction course. You paid the tuition. You booked the hotel. Then someone told you there would be math. Crash Math Academy was built for exactly this moment. This app takes you from basic addition all the way through advanced collision analysis formulas — one step at a time, in plain language anyone can follow. No math degree required. Just clear explanations, real crash examples, and the exact TI-30Xa calculator keystrokes for every problem. Created by a current law enforcement officer working in North Texas with over 35 years of collision investigation experience. Brian Watson 109, LLC. 7 PROGRESSIVE SECTIONS — 830 PRACTICE PROBLEMS Math Foundations — 13 lessons: basic operations, fractions, percentages, exponents, scaling, PEMDAS, algebra, formula rearrangement, and quadratics Pythagorean Theorem — Right triangles, distance, and scale diagram math Trigonometry — Sine, cosine, tangent, angle of impact, grade, and superelevation Unit Conversions — mph to fps, feet to meters, time-distance analysis Physics — Newton's Laws, kinetic energy, momentum, friction, and drag factor Core Crash Formulas — Skid speed, vault, pedestrian impact, yaw, truck/trailer, braking efficiency, e-scooter, bicycle, and height measurement Advanced — Delta-V, CRASH3, coefficient of restitution, closing speed, BEV, PDOF, inline momentum, angle collision X-Y components, and T-bone analysis Every problem generates fresh numbers each time — you learn the math, not memorize answers. Every solution shows detailed step-by-step work. TI-30Xa CALCULATOR KEYSTROKES Every lesson includes exact button-by-button keystrokes for the TI-30Xa — the same calculator used in reconstruction courses nationwide. 39 FLASH CARDS WITH VOICE READING Tap to flip between formula and explanation. Tap the speaker icon to hear the formula read aloud with a high-quality natural voice. 94 FORMULA REFERENCE CARDS A complete formula library in 8 sections. Every card shows the formula, defines every variable, and walks through a worked example. PRINT AND PDF EXPORT Export flash cards and formula cards to PDF. Pick exactly which cards to include. Print study sheets for class or pin formulas to your wall. QUIZZES AND 100-QUESTION FINAL EXAM Pass each section quiz to unlock the next. Take the 100-question practice exam pulling from all unlocked sections — the closest thing to your certification math test. IMPERIAL AND METRIC UNITS One tap switches the entire app between Imperial and Metric. Every lesson, formula, problem, flash card, quiz, and exam adapts. Imperial default for U.S. courses. Metric for investigators worldwide. PROGRESS TRACKING Track completed lessons, quiz scores, problem history, and overall readiness. The app identifies your weak areas. 100% OFFLINE — ZERO DATA COLLECTION No internet. No login. No ads. No tracking. Everything runs on your device. Your data stays on your phone. WHO THIS APP IS FOR Officers heading to their first crash course — no math background needed. Reconstructionist refreshing before recertification. Investigators worldwide. Anyone who was told "there will be math" and wants to show up ready. You are about to walk into the hardest math class of your career. Crash Math Academy makes sure you walk in ready.