Have you ever worried about giving a group of students a game to play independently, because you weren't sure that ANY of them knew the skill well enough to check the others' answers? I know I have. That's why I like all my games to be self-checking.
This is a simple-to-play game that will ensure students are practicing correctly. It can be played like regular "Kaboom". I also included the option to play it where players might draw a "Bonus" card (instead of a "Kaboom" card). This way, players don't have to give up their cards, and they have an extra card to count at the end of the game. We have all had that student who might pitch a fit if he or she had the most cards and then had to give them all back when he or she drew a "Kaboom" card.
Outside of cards includes 0 x 1 through 12 x 12, and inside shows the solution.