Abacus - Calculating on the lines.

Abacus - Calculating on the lines.

Calculating 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 values

Intuitive handling

Shells can be moved simultaneously

Optional display of the numeric values

Detailed explanation of the four basic arithmetic operations including illustrations, AirPrint support

Abacus to print out

Supports iPhone 5 and higher