Fun with numbers

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123456789101112
Across
  1. 7. I am the smallest counting number
  2. 9. 1 billion in Indian system is
  3. 10. Solve me:23+9×(6-3)-20
  4. 12. In Roman Numerals,I am written as XLIX
Down
  1. 1. Read me:6,000,002
  2. 2. Rounding off 8 and 16 to the nearest tens and find product you will get me
  3. 3. Readme:2,00,00,008
  4. 4. 1209574 is ____ than 1109754
  5. 5. Solve me by rounding off to nearest hundreds:875-384
  6. 6. Ten lakh in international system is
  7. 8. I come before the smallest three digit number
  8. 11. The digit 9 occurs ____ times between 1 and 100