Math puzzle

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Across
  1. 2. Shapes are part of this
  2. 3. what you do after a problem
  3. 6. What you do to find the length of something
  4. 9. ✖️
  5. 10. What is this 8+999 it’s not the answer
  6. 14. What is this called 7 to 9
  7. 15. -
  8. 16. the subject of the class
  9. 17. Square, rectangle, triangle
  10. 19. what am I doing 5,10.15,20,25,30,35
  11. 20. What is this # its not a hashtag
Down
  1. 1. The same this as an equation
  2. 4. 7 is = to 7
  3. 5. +
  4. 7. Something thats straight and goes on forever
  5. 8. I am the inside of a shape
  6. 11.
  7. 12. 24 is a of 4,6,3,8,2,12
  8. 13. What is this 6/12 it’s not a ratio
  9. 18. I am the outside of a shape