Evaluate expressions for specific values of their variables, including values that are non-negative rational numbers. Include expressions that arise from formulas used in real-world problems. Perform arithmetic operations, including whole-number exponents, in the conventional order when there are no parentheses to specify a particular order (Order of Operations). For example,

Expressions and Equations

- Apply and extend previous understandings of arithmetic to algebraic expressions.
Write, read and evaluate expressions in which letters stand for numbers.