Expression Crossword Puzzle

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Across
  1. 2. ___ + ___
  2. 3. The second thing you always do if there are parentheses
  3. 4. The first thing you always do
  4. 7. Divide 2 or more numbers
  5. 8. Subtracting 2 or more numbers
Down
  1. 1. Multiply 2 or more numbers
  2. 5. Adding 2 or more numbers
  3. 6. ___ - ___