The fifth great story crossword puzzle

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Across
  1. 2. how did ten look like?
  2. 3. what was the million sign?
  3. 5. what was the special thing that they used to count with?
  4. 10. The Babylonian system is credited as being the first know positional?
  5. 12. what was the symbol for the hundred?
Down
  1. 1. The ten thousand was a?
  2. 4. what is the Latin word for the decimal system?
  3. 6. The Babylonians had their own system of counting based on the number?
  4. 7. The number thousand was a?
  5. 8. what is the counting system based on?
  6. 9. what did they do to keep track of things in the pharaoh's kingdom?
  7. 11. did the system work well when they reached higher numbers?