(E) Describe the meaning of parentheses and brackets in a numeric expression5.4.F
(F) Simplify numerical expressions that do not involve exponents, including up to two levels of grouping
(Y6) Explore the use of brackets and order of operations to write number sentences (ACMNA134)
5.OA.1 Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.5.OA.2
5.OA.2 Write simple expressions that record calculations with numbers, and interpret numerical expressions without evaluating them. For example, express the calculation "add 8 and 7, then multiply by 2" as 2 × (8 + 7). Recognize that 3 × (18932 + 921) is three times as large as 18932 + 921, without having to calculate the indicated sum or product.