Common Core State Standards
CCSS.Math.Content.6.RP Ratios and Proportional Relationships
CCSS.Math.Content.6.RP.A Understand ratio concepts and use ratio reasoning to solve problems.
CCSS.Math.Content.6.RP.A.3 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.
CCSS.Math.Content.6.RP.A.3d Use ratio reasoning to convert measurement units; manipulate and transform units appropriately when multiplying or dividing quantities.