Mathmatics Puzzle

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Across
  1. 3. I am ten years old, which is a
  2. 4. how many grades are there at ECMCS
  3. 6. what is the current century
  4. 8. Christmas Day is December...
  5. 11. eight plus (five times two)equals
  6. 13. the fourth basic mathematical operation of arithmetic
  7. 14. the second basic mathematical operation of arithmetic
  8. 16. how many pennies are in one dollar
  9. 17. the age required to get a driver's license is
  10. 18. what is the third basic mathematical operation of arithmetic
  11. 19. (sixteen times two)plus three equals
Down
  1. 1. the first basic mathematical operation of arthmetic
  2. 2. how many quarters are in one dollar
  3. 5. (eight subtract four plus two)times two is
  4. 7. year of attack on the Twin Towers
  5. 9. how many students in Ms Debby/Ms Lucy's class
  6. 10. a decade times ten is a
  7. 12. a thousand years is a called a
  8. 15. a machine that does mathematical operations
  9. 20. twenty-five plus twenty-five equals