Standard

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.