Addition, Subtraction, Multiplication and Division

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Across
  1. 3. highest common factor of sixteen and twenty-four
  2. 5. the product of eight and nine
  3. 9. forty-five divide by five
  4. 10. product of twenty-one and three
  5. 11. nine squared
  6. 12. half minus quarter
  7. 14. the product of nine and six
Down
  1. 1. difference between one hundred and forty-five
  2. 2. forty-nine plus six minus forty-eight
  3. 4. four squared
  4. 6. product of five and six
  5. 7. five hundred divide by one hundred minus five
  6. 8. three quarters plus a quarter
  7. 13. two times twelve divide by eight