Math

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Across
  1. 5. If there are 15 passengers on a bus, how many people are left on the bus if there are 5 passengers at the first stop?
  2. 7. "0,1,1,2,3,5,8,13,21,?" What should replace the question mark?
  3. 9. What number is in the 5th digit after the decimal point of pi?
  4. 12. How many tangents can be drawn to a circle from a point on the circle?
  5. 13. If you divided 30 by half and added 10, what was it?
  6. 14. How many squares with a side of 5 cm to place into an area of ​​25 cm²?
  7. 15. What is the smallest perfect number?
Down
  1. 1. What is the set of numbers expressed by C?
  2. 2. What is the infinity symbol used in mathematics called?
  3. 3. Which number did Harezmi find?
  4. 4. Which scientist discovered the division sign?
  5. 6. Which scientist discovered the number "Pi" in mathematics?
  6. 8. What is the exact part of 8 inches in cm?
  7. 10. 6/2x(2+1) = ?
  8. 11. Two liter equals how many cubic decimeters?