Big Numbers Puzzle

123456789101112131415
Across
  1. 2. two thousand five hundred
  2. 5. 1000+400+50+0
  3. 7. 464+943
  4. 9. Round to the nearest 1000
  5. 12. 40,469-20,349
  6. 14. 999,999+99,999
  7. 15. 1,500,000-1,000,000
Down
  1. 1. 1,000,000 - 150,000
  2. 3. Round to the greatest place value 46,940
  3. 4. 2,000,000+400,000+80,000+1,000+300+90+9
  4. 6. four hundred
  5. 8. 700,000+10,000+8,000+100+20+8
  6. 10. two thousand four hundred
  7. 11. 1,520,124 + 7,434,212
  8. 13. round to the nearst hundred 1,542