Madder Hatter 3000

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Across
  1. 2. Expanded:9000+800+70+6
  2. 4. Expanded:6000+700+90+9
  3. 5. 8916-4027
  4. 6. seven thousand four hundred twenty one
  5. 9. 6500 rounded to nearest thousands
  6. 10. four thousand three hundred four
  7. 13. two thousand three hundred
  8. 15. 7000+380
  9. 16. 3100+88
Down
  1. 1. 3000+800+40+1
  2. 3. 8297-2107
  3. 4. 6300 rounded to nearest thousands
  4. 5. 3678 rounded to nearest thousands
  5. 7. 9278-4377
  6. 8. 6000+300+10
  7. 9. 700+30+8
  8. 11. 3000+28+300
  9. 12. 3000+1000+570+3
  10. 14. 2000+200+30+4
  11. 17. 8550+5