ACTIVITY + AIRCRAFT = DEFECTED ~~ Words Used : ACTIVITY, AIRCRAFT and DEFECTED.
  ACTIVITY + ARTICLES = CRYSTALS ~~ Words Used : ACTIVITY, ARTICLES and CRYSTALS.
  ACTIVITY + NINETEEN = DECIDING ~~ Words Used : ACTIVITY, DECIDING and NINETEEN.
  ACTIVITY + NINETEEN = STEEPEST ~~ Words Used : ACTIVITY, NINETEEN and STEEPEST.
  ACTIVITY + PLASTICS = TACTICAL ~~ Words Used : ACTIVITY, PLASTICS and TACTICAL.
  ACTIVITY + STRICTER = RESISTOR ~~ Words Used : ACTIVITY, RESISTOR and STRICTER.
  DEDICATE + DEFENDED = ACTIVITY ~~ Words Used : ACTIVITY, DEDICATE and DEFENDED.
  DETAILED + TRAVELED = ACTIVITY ~~ Words Used : ACTIVITY, DETAILED and TRAVELED.
  ENTRANCE + STRESSES = ACTIVITY ~~ Words Used : ACTIVITY, ENTRANCE and STRESSES.
  REACTORS + RESTORES = ACTIVITY ~~ Words Used : ACTIVITY, REACTORS and RESTORES.
  REVERSES + SWEETEST = ACTIVITY ~~ Words Used : ACTIVITY, REVERSES and SWEETEST.
  SCIENCES + SWEETEST = ACTIVITY ~~ Words Used : ACTIVITY, SCIENCES and SWEETEST.
  TYPIFIED + TYPIFIED = ACTIVITY ~~ Words Used : ACTIVITY and TYPIFIED.
The rules for cryptarithm puzzles are simple. Each letter represents one of the digits 0 to 9. Different letters represent different digits. The first digit in a number can't be 0. Your job is to find out what digit each letter represents. This page has links to puzzles containing "ACTIVITY"