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Khan Academy
Khan Academy: Evaluating Expressions With and Without Parentheses
Demonstrates the role of parentheses in a written expression by solving one with and without the parentheses. [2:06]
Khan Academy
Khan Academy: Dividing Whole Numbers by Fractions: Word Problems
By watching this video lesson, you will learn how to solve a word problem that involves dividing a whole number by a unit fraction. [2:31]