(B) Represent and solve multi-step problems involving the four operations with whole numbers using equations with a letter standing for the unknown quantity5.4.F
(F) Simplify numerical expressions that do not involve exponents, including up to two levels of grouping
(Y7) Create algebraic expressions and evaluate them by substituting a given value for each variable (ACMNA176)
6.EE.2.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). For example, use the formulas V = s3 and A = 6 s2 to find the volume and surface area of a cube with sides of length s = 1/2.