Tayen's math crossword

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Across
  1. 3. how many times it times itself
  2. 5. middle of a number line
  3. 6. the number times itself
  4. 9. the most often shown number in line
Down
  1. 1. can only be divided by 1 number
  2. 2. the answer is a division sum
  3. 4. the shape has 3 positions
  4. 7. Letters are showing for these sums
  5. 8. 90 degrees