MindCalc Arithmetic Trainer vs 11x13

Train your mental arithmetic ability with MindCalc! This is NOT your standard "what is 7 * 13?" type of game but here the result is already known and an arithmetic operator is given. Now you need to pick two numbers out of 9 to make this equation happen. The faster you solve your equation, the more points you gain. But if you make a mistake you need to start all over - so be careful! For an extra kick choose the highest difficulty where your score will be reset to zero in case you run out of time. You can also compete against another person to see who has stronger mental arithmetic skills!

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).