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introduction late 14c., from . introduction, from L. introductionem (nom. introductio) "a leading in," from introductus, pp. of introducere "to lead in, bring in, to introduce," from intro- "inward, to the inside" + ducere "to lead" (see duke). The sense of "formal presentation of one person to another" is from 1711. Shortened form intro is attested from 1923.

In Grade 6, instructional time should focus on four critical areas: (1) connecting ratio and rate to whole number multiplication and division and using concepts of ratio and rate to solve problems; (2) completing understanding of division of fractions and extending the notion of number to the system of rational numbers, which includes negative numbers; (3) writing, interpreting, and using expressions and equations; and (4) developing understanding of statistical thinking.

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