Order of operations

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Across
  1. 3. what is the third order of operations
  2. 5. what is the first order of operations
  3. 7. what is the second order of operations
  4. 8. what is the fifth order of operations
Down
  1. 1. what is the final order of operations
  2. 2. what is the fourth order of operations
  3. 4. what is the short hand for the order of operations
  4. 6. how many different orders of operation are there