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Somewhere in America, a mom is likely sitting in her car outside daycare, engine idling, doing the math. Her monthly payment for two kids has just ticked up. Again. Property taxes have climbed.

Susan Gilkerson, a math teacher and school bus driver, stood before a South Dakota education board and issued a warning. The proposed math standards the board was considering — just 36 pages, less ...

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Model math standards produced by conservative education advocates helped spark a battle in South Dakota that could spread to other states.

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The effort follows earlier battles over social studies and could spread to other states reviewing academic standards.

Susan Gilkerson, a math teacher and school bus driver, stood before a South Dakota education board and issued a warning.  The ...