Uhh there is "_" as spaces and one "/"

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Across
  1. 3. Parenthesis,exponents, multiplication, division, addition, subtraction.
  2. 4. p in PEMDAS
  3. 6. The D in PEMDAS
  4. 11. m in PEMDAS
  5. 12. a in PEMDAS
  6. 13. Multiplying the number by its self 3 times
  7. 14. Rearrange the word “Notarial”
Down
  1. 1. The opposite of Rational
  2. 2. 4 x 10³ in __________________
  3. 3. Multiply Exponents
  4. 5. S_____ R____ of 18
  5. 7. Equation for “Rise over Run”
  6. 8. s in PEMDAS
  7. 9. “Mirror the word” ɘtɒЯ tinU
  8. 10. Everyone's least or most favorite subject