M.5.3.9

 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. b. Identify parts of an expression using mathematical terms (sum, term, product, factor, quotient, coefficient); view one or more parts of an expression as a single entity. c. 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).