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...Why fractions decimals and percents a major goal for k mathematics education should be proficiency with including negative such is foundational algebra national math panel in one recent study of adults could not calculate tip on lunch bill th item from grade naep assessment ms thierry friends ate dinner at restaurant the was addition they left approximately what percent total did leave as b c d e results public west virginia more continues conceptual understanding operational procedures using them are mutually reinforcing key mechanism linking procedural knowledge ability to represent number line instruction focusing likely have broadest largest impact problemsolving performance when it directed toward accurate solution specific problems...