CC.2.1.6.D.1 - Understand ratio concepts and use ratio reasoning to solve problems
CC.2.1.6.E.3 - Develop and/or apply number theory concepts to find common factors and multiples
CC.2.1.6.E.4 - Apply and extend previous understandings of numbers to the system of rational numbers
CC.2.2.6.B.1 - Apply and extend previous understandings of arithmetic to algebraic expressions