Bilingual Beginners Book vs (Open Source) Mental Math

Bilingual Beginners Book is a bilingual picture and word book for new language learners. Great for new language learners both young and old. See words, touch the picture, hear the word in a new language! Each word is accompanied by an illustration and the word in two languages. 16 Word groups or chapters with 18 words in each. Languages include English, Korean, Japanese, Chinese, French, Italian, German and Spanish. A good selection of nouns, adjectives and verbs. Includes gender for nouns, and optional romanization for Chinese (also known as pinyin), Japanese and Korean. Navigation options include page by page and chapter by chapter movement buttons as well as page turning by moving your finger across the page. 288 Words in all. 80 pages. Illustrations by artist and illustrator Robert Schoolcraft | Designs (NYC).

A free, open-source mental math trainer. No ads, no paywalls, no locked content — every exercise and difficulty is included. Sharpen your arithmetic with quick timed tests, custom drills, and a library of mental-math tricks. Everything runs offline and your progress stays on your device. FEATURES Timed Tests A daily 60-second challenge plus sprints, a two-minute marathon, per-operation tests, and a hard mixed test — at four difficulty levels, each with best scores. Custom Trainer Pick a number domain (Times tables, Natural, Decimal, Money, Huge), choose one or more exercises, and set per-exercise difficulty from Easy to Super hard. All the Operations Addition, subtraction, multiplication, division, squares, square roots, fractions, percentages, and modulo. Mental Math Tricks Dozens of step-by-step tricks for faster addition, subtraction, multiplication, division, and squares — with worked examples and favorites. Practice Any Trick Every trick comes with a 60-second drill built for it: × 11 drills, squares ending in 5, numbers near 100, and more. Magic Square A number puzzle: make every row, column, and diagonal add up to the same total. Four levels, from 1-9 up to bigger number sets. Progress Tracking Solved totals, accuracy, best run, daily streak, longest streak, and a weekly activity view. Fast Sessions An on-screen keypad with instant answer checking and haptics. No ads. No paywalls. No account required. 100% Open Source The complete source code is public - see it, audit it, or contribute at https://github.com/Open-Apps-Studio/mental-math