Rounding Unlocked vs (Open Source) Mental Math

Rounding Unlocked teaches kids how to round numbers the right way — through understanding, not just memorization. Built by a real educator with 20+ years of experience teaching in Philadelphia classrooms, this app takes children through 6 carefully sequenced worlds that build rounding fluency from the ground up. What your child will learn: World 1: What is Rounding? — number lines and the mountain rule World 2: Rounding to the Nearest 10 — two-digit numbers World 3: Rounding to the Nearest 100 — three-digit numbers World 4: Rounding to the Nearest 1,000 — four-digit numbers World 5: Rounding Decimals — to the nearest whole number World 6: Estimating with Rounding — real-world problem solving Features: Interactive tips that teach the concept before practice begins Visual number lines, mountain diagrams, and place value spotlights 10-question practice and quiz for every world Rounding Master Challenge — 40 questions across all 6 worlds Audio narration for every tip — perfect for struggling readers Worlds 1 and 2 are completely free Rounding is one of the most important foundational math skills. Unlock it today.

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