11x13

By Matthias Hennemeyer on AppTrack Ninja.

Mental math up to calculus

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 subscrip…

Categories: Education, Games

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