Andrew's number puzzle

1234567891011
Across
  1. 1. 100 divided by 4
  2. 3. 457 + 867
  3. 4. 1 x 2 x 3 x 4 x 5
  4. 5. 888 + 111
  5. 7. 144 divided by 12
  6. 8. 1043 - 906
  7. 9. 999999 + 1
  8. 10. 468 + 468
  9. 11. 118 divided by 2
Down
  1. 2. 271605 + 271605
  2. 3. 100 x 100
  3. 6. 4938 + 4938
  4. 7. 10 x 10 + 10 x 10 - 100
  5. 8. 312 + 763
  6. 9. 453 + 783