11x13 vs Oyster | Middle School Math

A short problem, nine answers, one correct — 11x13 trains mental math with no clutter and no words in the problems. THE BASIC OPERATIONS ARE FREE. NOW AND FOREVER. Addition, subtraction, multiplication and division with level bands that grow with you: from small times tables over carrying to the 11–19 tables — the app's namesake — plus chained problems like 47 + 8 + 6 at high levels. WITH “EVERYTHING” YOU PRACTICE EVERY OPERATION. Unlock every package permanently with a one-time purchase or for the duration of a subscription. The 14-day app trial ends automatically without starting a subscription: • Percentages: from 50% of round numbers to surcharge and discount • Roots: squares and cube roots • Powers: up to powers of two and ten • Derivatives and integrals: from monomials to binomials • Geometry: symbol equations (▲ + ▲ = 12), counting corners, matching shapes • Fractions: adding like fractions, simplifying, unlike denominators, multiplying Your progress grows per operation, syncs via iCloud, with progress charts and a Game Center leaderboard. Easy to keep at it: a daily practice reminder at the time you choose, a Home Screen widget with the problem of the day, and statistics with streak, week-over-week comparison and band history. With a true iPad layout and hardware keyboard support (keys 1–9). Subscriptions renew automatically until cancelled in App Store subscriptions. A one-time purchase provides permanent access. Mistake notebook: The last 100 tasks you answered incorrectly are saved on this device. Review up to ten tasks without time pressure. A task leaves the notebook after a correct first answer in two separate rounds. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

OYSTER TURNS MATH FROM A LIST OF ASSIGNMENTS INTO A JOURNEY WORTH EXPLORING. Designed for Grades 5–8, Oyster helps students discover what’s coming next in math before they meet it in class. With a clear learning path, 4,000+ teacher-created interactive activities, and a game-like galaxy to explore, students always know what to learn, practice, and improve next. FLIPPED LEARNING: Learn before class. Practice with purpose. See yourself improve. WITH OYSTER, STUDENTS CAN: * Explore upcoming math topics before class and walk in prepared * Build skills across numbers, fractions, algebra, geometry, measurement, data, and probability * Learn by doing with number lines, matching, drawing, model building, object hunts, visual problem solving, and more * Turn daily practice into a habit with missions, streaks, rewards, and badges * Revisit challenging concepts and strengthen skills that need more practice * See progress across different math abilities with the Skill Crystal * Explore six unique worlds, unlock new avatars, and choose their own captain * Learn in an ad-free environment designed to keep the focus on math FOR PARENTS, OYSTER MAKES PROGRESS EASIER TO UNDERSTAND. See topic-by-topic progress, strengths, areas that need more practice, streaks, and achievements in one place. Daily time limits help families keep learning routines balanced. OYSTER PREMIUM Start for free and upgrade when you’re ready. Premium includes access to the full learning journey, unlimited energy, and exclusive avatars. Eligible users can start with a 7-day free trial. Payment is charged to the App Store account for the selected plan. The subscription renews automatically unless canceled at least 24 hours before the end of the current billing period. Subscriptions can be managed or canceled in App Store account settings. PRIVACY POLICY: [https://getoyster.app/en/privacy](https://getoyster.app/en/privacy) TERMS OF USE: [https://www.apple.com/legal/internet-services/itunes/dev/stdeula/](https://www.apple.com/legal/internet-services/itunes/dev/stdeula/)