Addition and Subtraction

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Across
  1. 1. 687,926-279,853=
  2. 4. 56,489+86,792=
  3. 7. 8,924+6,978=
  4. 9. 3,500-98=
  5. 10. 297,831-67,985=
  6. 11. 19,765-3,900=
  7. 13. 16,789-8,265=
Down
  1. 2. 256,793+458,267=
  2. 3. 197-99=
  3. 4. 65,498+57,892=
  4. 5. 352,879+45,212=
  5. 6. 9,824-7,586
  6. 8. 56,892-9,657=
  7. 12. 486+99=