【實用教育app】Abacus - Calculating on the lines|最夯免費app

Abacus - Calculating on the linesCalculating on lines was in wide use in the Middle Ages. Adam Ries already described that vivid arithmetic technique. Coins, stones, or even shells were displayed on lines with diverse valences. The app imitates an abacus and affords the following functions:Two columns for displaying numeric valuesIntuitive handling Shells can be moved simultaneouslyOptional display of the numeric valuesDetailed explanation of the four basic arithmetic operations including illustrations, AirPrint supportAbacus to print outSuitable for the math lesson

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