STANDARD 6.EE.A.2

Write, read, and evaluate expressions in which letters stand for numbers.
a. Write expressions that record operations with numbers and with letters standing for numbers.  e.g., Express the calculation “Subtract y from 5” as 5–y.
b. Identify parts of an expression using mathematical terms (term, coefficient, sum, difference, product, factor, and quotient); view one or more parts of an expression as a single entity.  e.g., Describe the expression 2(8+7) as a product of two factors; view (8+7) as both a single entity and a sum of two terms.
c. Evaluate expressions given specific values for their variables.  Include expressions that arise from formulas in real-world problems.  Perform arithmetic operations, including those involving whole-number exponents, in the conventional order (Order of Operations).  e.g., Use the formulas V=s³ and SA= 6s² to find the volume and surface area of a cube with sides of length s = ½.  Note: Expressions may or may not include parentheses. Nested grouping symbols are not included.