Simplify Expressions Crossword Puzzle

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Across
  1. 3. Contains numbers, variables, and operations.
  2. 5. Subtract, add, divide, and multiply.
  3. 7. Operations that cancel each other. Example: subtraction and addition; division and multiplication.
  4. 9. Distribute to eliminate the parenthesis and combine like terms.
  5. 10. Same distance from zero but on opposite sides of number line. EX: -10 and 10.
  6. 12. A number without a variable.
Down
  1. 1. A letter that represents a unknown number.
  2. 2. When we "plug in" a number into a variable to evaluate the expression.
  3. 4. Same variable and same exponent.
  4. 6. A number multiplied with a variable (number in front of a variable).
  5. 8. A variable, number, or a variable times a number.
  6. 11. Two expressions with an equal sign between them.