##### Across

**5.**a value for a variable that makes an equation true**6.**to "plug in" a value for a variable in an algebraic expression, then simplify**8.**a letter or symbol that stands for an unknown number**11.**a value that can be divided evenly into another, with no remainder**14.**branch of math that involves using variables for unknown quantities**16.**an operation that undoes another**19.**operation in which a number is multiplied by itself a certain number of times**20.**a number on its own, not being multiplied by a variable**21.**a math statement containing numbers, variables, and operations, with an = sign**22.**mathematical terms with the same variable(s) being raised to the same power; can be added or subtracted to each other**23.**a math statement containing numbers, variables, and operations, with one of these signs: < > ≤ ≥

##### Down

**1.**math symbol ≤**2.**the sequence in which we simplify the operations in an expression**3.**math symbol ≥**4.**a number being multiplied by a variable**7.**describes expressions that simplify to the same value**9.**a math statement containing numbers, variables, and operations; no = sign**10.**math symbol ≠**12.**a combination of numbers, variables, or both; separated by + and - signs in an expression**13.**the ________ property states that a number on the outside of a parenthetical expression must be multiplied by all terms inside**15.**math symbol <**17.**math symbol =**18.**math symbol >