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In this Monday, Dec. 14, 2015, file photo, second-graders write out their math solutions at Sageville Elementary School in Sageville, Iowa. Common Core standards for mathematics expect students to conceptually understand math. Multiple strategies, versus a single algorithm, are taught. Forty-two states, including Iowa, Wisconsin and Illinois, have adopted the standards designed to prepare K-12 students for higher education and the professional world. (Jessica Reilly/Telegraph Herald via AP) ** FILE **

In this Monday, Dec. 14, 2015, file photo, second-graders write out their math solutions at Sageville Elementary School in Sageville, Iowa. Common Core standards for mathematics expect students to conceptually understand math. Multiple strategies, versus a single algorithm, are taught. Forty-two states, including Iowa, Wisconsin and Illinois, have adopted the standards designed to prepare K-12 students for higher education and the professional world. (Jessica Reilly/Telegraph Herald via AP) ** FILE **

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