Weekly Maths Puzzle

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Across
  1. 3. slope of a line
  2. 5. 1000 metres
  3. 6. five sided shape
  4. 7. distance from side to side in a shape
  5. 10. the average
  6. 11. writing an fraction in its lowest terms
  7. 12. sharing a number into equal parts
  8. 13. angle smaller than 90 degrees
  9. 15. inverse of a number
  10. 18. 12 sided shape
  11. 20. the perimeter of a circle
Down
  1. 1. taking away
  2. 2. plus
  3. 4. diagram showing the relationship between variables
  4. 8. the bottom number of a fraction
  5. 9. the product of
  6. 14. a number that is divided by one and itself
  7. 16. number that can be positive negative or
  8. 17. the only even prime number
  9. 19. the top number of a fraction