Ratios and proportional relationships
6.RP.A.3.C
Find a percent of a quantity as a rate per hundred, and solve problems involving finding the whole given a part and the percent.
Practice for this standard
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Percentages
Percent of a number, percent change, and moving between fractions, decimals and percents.
Official wording and the full standard: CCSS.MATH.CONTENT.6.RP.A.3.C