The product contains 12 different math center activities and ideas. Each center activity is designed to challenge students and should take 45 minutes to 1 hour to complete. These math centers may be used individually, for an entire week, or possibly even 2 weeks. The activities cover many different skills: place value, addition, subtraction, geometry, measurement, and more. This would be a great review at the end of the year. Each activity is aligned to the common core standards (ccs).