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Open Textbook to Accompany Developmental Math (English version):
Libro de Texto Abierto to Accompany Developmental Math (Spanish version):
Adult Ed Hippo Playlists (for TABE and GED) developed by the State of Kentucky:
Order of Operations Tutorial:
MIT BLOSSOMS for Mathematics:
Visual Fractions:
Ratios and Proportions:
MathArchives from Univ. of Tennessee--Topics in Arithmetic for Grades 9-12:
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