Upside-Down Calculator Crossword

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123456
Across
  1. 1. 551 x 14
  2. 2. 2669 x 2
  3. 3. 6148 - 485
  4. 5. 9519 x 4
Down
  1. 1. 4398 - 894
  2. 2. 2646 + 5432
  3. 4. 67 x 5
  4. 6. 885-254