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Babylonians

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Exact origin unknown

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Incas

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Freidrich Froebel

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Maria Montessori

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1920: National Council of Teachers of Mathematics Founded

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1920: National Council of Teachers of Mathematics Founded

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1950s-1970s: New Math & Open Education Movement

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1950s-1970s: New Math & Open Education Movement

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Called for the use of manipulatives

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2002: Virtual Math Manipulatives Defined19

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2002: Virtual Math Manipulatives Defined19

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Patricia Moyer

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Enrique Ortiz, University of Central Florida