Semi-Magic Squares Posted on September 8, 2017April 9, 2021 by G4G Team Semi-magic squares are thought of as matrices in this arithmetic exploration. Split up a a shuffled deck of cards to create a magic-square out of playing cards with additional challenges.Submitted by: James TantonTime Required: 30 minutesYou’ll Need: paper, pencil, and a deck of playing cardsDownload Activity