Wait, isn't this a math class?

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Across
  1. 3. Parentheses, Exponent, Multiplication, Division, Addition, Subtraction
  2. 5. ( )
  3. 9. Multiplication, Division, Addition, Subtraction, Exponent
  4. 10. +
  5. 12. What type of numbers are these? {1, 2, 3, 4, 5}
  6. 14. What type of number is this? {-1.29042...}
  7. 15. 20 x 5 = 100
  8. 16. What type of numbers are these? {0, 1, 2, 3, 4, 5}
Down
  1. 1. What type of numbers are these? {0, 1, -1, 1/2, 0.555, 0.5432...}
  2. 2. 3
  3. 4. 20 x 5
  4. 6. -
  5. 7. 3/2
  6. 8. Put the letters in alphabetical __________ (a, b, c, d, e...)
  7. 11. What type of numbers are these? {-1, -2, -3, -4, -5}
  8. 13. What type of numbers are these? {1/2, 0.3, 3.444, 3/4}