Mathematical Crossword

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Across
  1. 3. A shape with many sides
  2. 4. All the same
  3. 7. Only part of something
  4. 13. Eight sided
  5. 15. The size of a flat shape
  6. 17. It's value can change
  7. 18. The shape of a football
  8. 19. Half a circle
  9. 21. Numbers below freezing
Down
  1. 1. The study of shape
  2. 2. The answer when you multiply numbers
  3. 5. Find the value of something
  4. 6. At the same time
  5. 8. A 4 sided shape
  6. 9. The answer when you subtract numbers
  7. 10. Parallel to the ground
  8. 11. Not equal to
  9. 12. Exactly the same
  10. 14. A corner
  11. 16. To cut something in half
  12. 20. On average not pleasant