Fun in math

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Across
  1. 1. the product of distance and time
  2. 4. a part of a whole
  3. 5. a four sided figure
  4. 7. study of unknown
  5. 8. a collection of well defined objects
  6. 9. many sided closed figure
  7. 10. perimeter of a circle
Down
  1. 2. repeated subtraction
  2. 3. repeated addition
  3. 4. process of finding factors of given number
  4. 6. the other name for x-axis