Arcana: Mental Math Tricks

By MOHAMMAD HASSAN GARSHASB on AppTrack Ninja.

Speed math, one spell a day

Arcana teaches mental math the way a good language app teaches a language: one technique at a time, practised until it's fast, and brought back just before you'd forget it. Every technique is a spell. Multiply any number by 11 in your head. Square 65 in two seconds. Work out a 15% tip before the waiter comes back. Name the day of the week for any date in history. Each spell starts with a short explanation and a worked example, then a drill that adapts to you, so every problem is just hard enough. FROM TIMES TABLES TO MATHEMAGIC Eight ranked realms, 58 spells in one continuous ladder: • Initia…

Categories: Education

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