An expression is a representation of a quantity. It contains numbers, variables, and/or computational operation symbols. It does not have an equal symbol (e.g., 5, 4 + 3, 8 − 2, 2 × 7).
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An expression represents a quantity. It contains numbers, variables, and/or computational operation symbols. It does not have an equal symbol (e.g., 5, 4 + 3, 8 − 2). Students at this level are not expected to use the terms expression or variable.
Understand that an expression uses symbols to define a relationship and shows how each number in the list, after the first number, is related to the preceding number.
Understand that expressions can be numerical or variable or a combination of numbers and variables.
A verbal expression describing a relationship involving one operation can be represented by an expression with a variable that mathematically describes the relationship. Numbers are used when quantities are known; variables are used when the quantities are unknown.
Use an expression with a variable to represent a given verbal expression involving one operation (e.g., “5 more than a number” can be represented by 𝑦 + 5). (c)