Multiplication Strategies - Which Strategy is best?

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Across
  1. 3. 25X32
  2. 4. 21X22
  3. 5. 12X25
  4. 8. 31X198
  5. 9. 87X31
  6. 11. 121X15
  7. 13. 16X17
  8. 14. 32X24
Down
  1. 1. 45X22
  2. 2. 56X65
  3. 3. 201X41
  4. 6. 99X99
  5. 7. 125X35
  6. 8. 32X21
  7. 10. 21X32
  8. 12. 37X24
  9. 13. 99X23