Math Quiz Disguised as a Crossword

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Across
  1. 3. odd numbers from zero to ten
  2. 4. 64-8-16-8
  3. 5. 5*5
  4. 6. 200+800
  5. 8. 42/2
  6. 9. 500-(1500+2500)
  7. 12. simplify 4/8 (fraction)
  8. 14. (67*20)/2
  9. 15. (8*4)/2
  10. 16. 3.14*10
  11. 17. 20*-1
Down
  1. 1. ((5+5)*2)+5
  2. 2. 1000-108
  3. 3. 100+1150
  4. 6. 25*(8/2)
  5. 7. even numbers from zero to ten (not including ten)
  6. 10. 2.12+1.02
  7. 11. simplify 4/8 (decimal)
  8. 12. (5*3)-5
  9. 13. 2*(10+2)
  10. 16. 180*(8/4)
  11. 18. (150*2)-50