The 4th Grade Math 2 Base Center Kit comes with 2 LP Base, 6 curriculum packs with 12 cards each, 864 questions and answers that cover: Whole Numbers, Fractions, Decimals and Percents, Algebra Concepts, Geometry & Measurement, and Probability & Statistics. It is packaged in a clear vinyl bag for easy storage and organization. This kit is great for Math Centers and allows 2 - 6 students to work at the same time. Additional bases will allow for more students. The curriculum has been carefully crafted to meet the needs of State and National Math Standards. See the individual titles and slide shows for detailed descriptions and previews of curriculum.