Math Crossword Puzzle

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Across
  1. 2. A set of numbers with no answer.
  2. 3. The amount of space in a 3D shape.
  3. 5. When a price is brought down from the original price.
  4. 8. A set of numbers with an answer.
  5. 12. Numbers that are smaller than 0.
  6. 14. The amount of a number.
  7. 15. The average in a set of numbers.
Down
  1. 1. The exact distance from 0.
  2. 4. The middle number in a set of numbers.
  3. 6. The amount of space in a 2D shape.
  4. 7. When the price goes up because of taxes.
  5. 9. The number that occurs most often.
  6. 10. Numbers that are larger than 0.
  7. 11. The number that is next to a variable.
  8. 13. A shape with 3 sides.