Number Explosion (for cool people only)

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1234567891011121314151617181920
Across
  1. 1. 4289-893
  2. 6. 64298+63
  3. 7. 9000000+600000+50000+4000+800+60+8
  4. 9. 4206+893
  5. 11. round 89060 to the lowest place
  6. 13. four thousand, nine hundred twenty-six
  7. 16. seven thousand, four hundred eighty-two
  8. 17. 4057+82
  9. 18. 4057-82
  10. 20. round 4298 to the highest place
Down
  1. 2. 90000+6000+500+40+8
  2. 3. 9000+600+50+4
  3. 4. round 4609 to the hundreds place
  4. 5. six thousand, eight hundred twenty-nine
  5. 8. 8968-403
  6. 10. 8968+403
  7. 12. 900000+60000+5000+400+80+6
  8. 14. 42968--36
  9. 15. eight thousand, three hundred seventeen
  10. 19. round 4809 to the highest place