PARALLEL + PLATFORM = SMALLEST ~~ Words Used : PARALLEL, PLATFORM and SMALLEST.
PLATFORM + PLATFORM = IMPROPER ~~ Words Used : IMPROPER and PLATFORM.
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 "PLATFORM"