Order of Operations

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Across
  1. 3. Sixth step of PEMDAS
  2. 4. Third step of PEMDAS
  3. 6. Which comes first, parenthesis or exponents
  4. 7. Fifth step of PEMDAS
Down
  1. 1. Second step of PEMDAS
  2. 2. Forth step of PEMDAS
  3. 5. Please Excuse My Dear Aunt Sally