Order Of Operation

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Across
  1. 3. the word difference equals _
  2. 4. 1st rule of (OoO)
  3. 6. Another Word for (OoO)
  4. 8. The answer to division
Down
  1. 1. the word sum equals _
  2. 2. 3rd rule of (OoO)
  3. 5. 2nd step of (OoO)
  4. 7. 4th rule of (OoO)