11x13 vs 1×1 Master

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. One single purchase unlocks everything permanently — try it free for 14 days: • 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 Your progress grows per operation, syncs via iCloud, with progress charts and a Game Center leaderboard. Now with a true iPad layout and hardware keyboard support (keys 1–9).

Your times tables – automatic at last. 1×1 Master is the times-tables trainer for adults. For everyone who briefly freezes when 7×8 or 6×9 comes up in everyday life – and finally wants to change that. Calm, respectful, and free of childish clutter. No brute-force memorization: 1×1 Master builds on the tables you already know and derives every hard fact from them. HOW IT WORKS • 2-minute sprint in three phases First estimate the magnitude, then recall the fact reliably, and finally apply it to everyday situations – short enough for every day. • Anchor hints Hard facts are derived from anchors you already know: 7×8 becomes 5×8 plus 2×8. Real understanding instead of blind drilling. • Spaced repetition Speed and accuracy decide when a fact comes back. You practice exactly what is still shaky – not what you mastered long ago. • Mastery matrix The 10×10 matrix shows at a glance which facts are automatic, which are in training, and which are still uncertain. • No-shame onboarding A calm check without right-or-wrong judgment determines your starting point. No pressure, no red pen. PRIVATE BY DESIGN • No accounts, no sign-up • No cloud – everything stays on your iPhone • No ads, no tracking • Works completely offline Times tables are not kid stuff. They are a foundation – and it is never too late to finally lay it properly.