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"Percent of Change" is not generally intuitive to students. Handing them a formula too soon can be detrimental to their understanding of how percent increase and decrease actually work.
Using this investigation will help students conceptually and visually understand how percents of change behave.
An intriguing investigation explores how changing the length of the typical school week impacts the percent of increase or decrease. The visual approach presented guides students to not only discover the formula in the textbook, but visually understand why the formula works.