This set contains 135 triangle math fact cards using numbers 1-9 as partners. For each of the 45 problems that can be created, I have 3 cards (missing right, missing left, missing top). I also color coded them for easy sorting. Teal cards are totals 2-10 and magenta cards are 11-18. They are in a slideshow so you can use them as virtual flashcards. Google has a "Slides Randomizer" that can even mix them for you.