Mathematics Through the ages

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Across
  1. 4. The person who invented zero
  2. 6. A unit of time for 1/100th of a second.
  3. 7. the number of digits in pi
  4. 10. Father of Mathematics
Down
  1. 1. The name of the symbol of division
  2. 2. The only number that is spelt with letters arranged in alphabetical order.
  3. 3. The country that invented the decimal system
  4. 5. Oldest Branch of mathematics
  5. 8. The origin of a calculator
  6. 9. The only number that cannot be represented in Roman Numerals