Mathematics

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Across
  1. 3. answer in multiplication
  2. 5. top number in a fraction
  3. 8. answer in subtraction
  4. 9. numbers greater than zero
Down
  1. 1. bottom number in a fraction
  2. 2. answer in division
  3. 4. answer in addition
  4. 6. number you can't have as a denominator
  5. 7. numbers less than zero
  6. 9. a number only divisible by one and itself