PEMDAS

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Across
  1. 2. 240/2 * 4
  2. 3. 4(250 + 45)- 10
  3. 4. 3000 - 50/(12 - 7)
  4. 5. 2^3 + 400
  5. 6. 500 - 30 + 40
Down
  1. 1. 8 + 40/2 * 300
  2. 2. 800 * 6 - 90
  3. 3. 250 - 50 + 100 * 8
  4. 5. 700/(4 * 5) + 10
  5. 7. 650 + 5 * 100