Understand ratio concepts and use ratio reasoning to solve problems.
Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations. (6.RP.3)
c. Find a percent of a quantity as a rate per 100 (e.g., 30% of a quantity means 3 1 times the quantity); solve problems involving finding the whole, given a part and the percent. (6.RP.3c)
More information and the complete College and Career Readiness Standards can be found here.