Ski Day Math Puzzle

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Across
  1. 2. result of multiplication
  2. 3. SI unit of time
  3. 5. pairing of values where each input is paired with one output
  4. 12. Measurement of 2-d space
  5. 13. SI unit for capacity
  6. 15. equation involving two ratios
  7. 16. SI unit for energy
  8. 17. a(b+c)=ab+bc
  9. 19. repeated multiplication
  10. 21. SI unit for mass
  11. 22. result of division
  12. 23. out of 100
  13. 24. SI unit of distance
  14. 27. a number that divides into another evenly
  15. 28. middle point of an angle
  16. 29. comparison of two numbers
  17. 30. a+b=b+a
  18. 31. Measurement of 3-d space
Down
  1. 1. if a=b and b=c, then a=c
  2. 3. indicates addition
  3. 4. (x,y)
  4. 6. SI unit for force
  5. 7. set of all points equidistant from a center point
  6. 8. distance around an object
  7. 9. repeated addition
  8. 10. a fixed value
  9. 11. Closed figure with line segments for sides
  10. 14. a whole number or the negative of one
  11. 18. make into a single number
  12. 20. to cut perfectly in half
  13. 25. a placeholder or unknown
  14. 26. same distance apart at any given point