MATH CROSSWORD

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Across
  1. 4. 81:(3X3)+ (41+2)
  2. 5. 10+4
  3. 9. (64:4)+(56:7)-(12:3)+(13X6)
  4. 10. (17X4) + (85:5)
Down
  1. 1. 66-5-19-20
  2. 2. 90:(9X2)+ (5X2)
  3. 3. 15X(2+2) + (77:11)
  4. 6. (80:8)-(4:2)
  5. 7. (13X2) + (66:11)
  6. 8. (8X2) + (15:5)