1st year crossword

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Across
  1. 4. acronym for the order in which to complete a sum
  2. 6. different signs=keep the sign of the bigger number and _______
  3. 7. How many Factors do prime numbers have
  4. 8. numbers greater than 0
Down
  1. 1. When the order of addition or multiplication does not matter
  2. 2. Positive whole Number
  3. 3. numbers less than 0
  4. 5. Poisitve and negative whole numbers including zero
  5. 9. ____ sign=positive answer