All classes in grades 1-4 in elementary schools can participate. The classes compete as a team, and they need to have at least five students. If the class is smaller, it should be combined with another class in order to participate.

For example: Class 1 has 3 students and class 2 has 2 students. Class 1 and 2 are to be combined so that the total number of students is 5. This can be done when creating the students' accounts in the User Management tool in the Math World learning program by marking the class as 1-2 in the “Class” field.

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