Amauri puzzle

Edit Answers
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Across
  1. 3. 150+150
  2. 4. 500000-400000
  3. 5. (100+100)
  4. 6. 5×100
  5. 7. 5000+5000
Down
  1. 1. 300+100+200
  2. 2. 5000-250
  3. 3. (5000-2000)
  4. 4. 50+50
  5. 5. 1000+1000
  6. 7. (100×10)