You could have downloaded Number String 1.5.3 for Mac from our application library for free. The application is included in Education Tools. The bundle id for this app is com.elementarysoftware.numberstring. The most popular version of Number String for Mac is 1.5. The actual developer of this free software for Mac is Elementary Software. Number_string_x.dmg is the default file name to indicate this program's installer.
From the developer:
6 cards are dealt face up. The player tries to combine some or all of the first 5 cards to equal the value of the sixth card. Players may use any combination of addition, subtraction, multiplication and division. Up to 2 pairs of parenthesis may be added if desired. The cards and parenthesis use a "drag and drop" style interaction.
You may want to check out more software for Mac, such as Localizable Strings Merge, 18 Strings or Localizable.strings, which might be related to Number String.
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