My students are big fans of self correcting puzzles! They are such an easy center because the kids know right off the bat if the answer is correct. One of their favorite self correcting puzzles is the number word puzzle. It’s quite simple, students match the numeral to the number word. I will tell you that by using this puzzle during math centers, even my lowest readers can recognize the word form of every number from 1 – 20! You can download a copy free at TPT or Raki’s Shop.