Chapter 4
Common Core Standards / Main Skills Addressed
6.EE.2a Write expressions that record operations with numbers and with letters standing for numbers
6.EE.2c Evaluate expressions at specific values of their variables. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including those involving whole-number exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations.)
6.EE.4 Identify when two expressions are equivalent (i.e., when the two expressions name the same number regardless of which value is substituted into them).
6.EE.6 Use variables to represent numbers and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set.
6.RP.1 Understand the concept of a ratio and use ratio language to describe a ratio relationship between two quantities.