Quandale Dingle does math

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Across
  1. 4. PEMDAS
  2. 6. answer to division
  3. 7. expression with terms
  4. 8. no variable
  5. 9. multiply parentheses
  6. 10. value of number
  7. 12. one math expression
  8. 13. opposite of multiplication
Down
  1. 1. a letter in an expression
  2. 2. opposite of division
  3. 3. answer to multiplication
  4. 5. no matter which group
  5. 11. no matter which order