Math Crossword Puzzle

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Across
  1. 3. The rule for solving expressions (Parentheses, Exponents, Multiplication/Division, Addition/Subtraction)
  2. 6. Get the variable alone on one side of the equation
  3. 9. A single part of an expression or equation separated by + or -
  4. 10. Combine like terms or reduce an expression
  5. 11. A mathematical phrase without an equal sign
  6. 13. the longest distance across the circle, passing through the center
  7. 16. Multiplying a number by a group in parentheses
  8. 18. A mathematical phrase with an equal sign
Down
  1. 1. A fixed number (no variable)
  2. 2. Terms with the same variable and exponent
  3. 4. The opposite operation used to isolate a variable
  4. 5. the perimeter of the circle
  5. 7. the distance from the center of the circle to any point on its edge
  6. 8. The number multiplied by a variable
  7. 12. A letter that represents an unknown number
  8. 14. the space inside a shape (in this context, a circle)
  9. 15. a 2d shape where every point on its circumference is the same distance from its center, its perfectly round
  10. 17. it represents the ratio of a circle's circumference to its diameter