Math Crossword Puzzle

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Across
  1. 2. Most of the worlds temperature scale.
  2. 4. The American temperature scale.
  3. 5. The distance around a 2D shape.
  4. 8. The top number on a fraction.
  5. 11. A whole number in a polynomial.
  6. 12. A number beside a variable in a polynomial.
  7. 15. The space occupied by a 3D object.
  8. 16. Opposite of subtraction.
  9. 17. A whole number beside the fraction.
  10. 18. An expression with more than two algebraic terms.
  11. 19. A letter being used for an unknown number.
  12. 20. The numerator is larger than the denominator.
Down
  1. 1. The distance up the side of a pyramid.
  2. 3. Opposite of addition.
  3. 6. A number written above and to the right of a base number.
  4. 7. Opposite of division.
  5. 9. The space occupied by a flat space
  6. 10. Opposite of Multiplication.
  7. 13. Two numbers on top of each other, with a line separating.
  8. 14. The bottom number on a fraction.