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To play, click on the desired block with your mouse, or move the cursor with your ARROW KEYS. When the block is highlighted, type your letter. To switch from across to down or vice versa use the ARROW KEYS or Control-CLICK with your mouse. To clear the puzzle, click on your browser's REFRESH or RELOAD button. After clicking "Check Answers", incorrect letters will be marked with an "X". Your teacher has access to the completed puzzle.   Across 1. A statement that equates two equivalent expressions. 7. A word equation that represents a real-life problem. 8. An ________ expression is an expression with variables. 10. Two algebraic expressions are ________ if they have the same value for all values of their variable(s). 12. The number in a power that represents the number of times the base is used as a factor. 15. A statement in which two expressions are equal. 16. The ________ of an expression are the parts of an algebraic expression that are added together. Down 2. A ________ expression is an expression that consists of numbers, operations, and grouping symbols. 3. A letter that is used to represent one or more numbers. 4. The ________ of an expression is the result when the variables in an algebraic expression are replaced by numbers and the expression is simplified. 5. The number that corresponds to a point on a number line. 6. Numbers that can be written as the ratio of two integers are called ________ numbers. 9. The numbers ... , -3, -2, -1, 0, 1, 2, 3, ... 11. The point on a number line that corresponds to a number is called a ________ of a real number. 13. A set of rules that gives the order in which operations should be performed when evaluating expressions. ________ of operations. 14. An expression such as 25, which represents 2 · 2 · 2 · 2 · 2 = 32.