This is a blank Matho (Bingo, spelled differently) board used in transparent sleeves. Students are grouped in groups of four or less and work to solve a worksheet of 24 problems (of your own creation). This would also be an excellent way to check homework. Students fill in solutions as the warm-up; each group member completes problems for homework or in class and fills in his/her row of solutions on the card. The teacher begins calling out the solutions and can also walk around to check who has their rows filled in (if they aren't filled in, the student did not complete the homework assignment). First student group to get a matho wins. This method saves paper, which is for some reason an initiative in some districts). Matho can be re-used for every concept but works best with minimal step problems like simple factoring, simplifying rational exponents and radicals, finding the discriminant, etc.