What is the place value of the underlined digit in each number?

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123456789101112131415
Across
  1. 4. 56342
  2. 9. 3.546
  3. 10. 18.07
  4. 12. 9.102
  5. 14. 316.031
  6. 15. 63
Down
  1. 1. 2.1357
  2. 2. 9.779
  3. 3. 25.4
  4. 5. 0.027
  5. 6. 3642
  6. 7. 2.591
  7. 8. 25.46
  8. 11. 5224
  9. 13. 2.54
  10. 14. 3.336