number and figure

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123456789101112131415161718
Across
  1. 5. the number by which a multiplicand is multiplied
  2. 10. the number that is multiplied by the multiplier
  3. 12. a four-sided polygon
  4. 14. ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point
  5. 15. a parallelogram with four equal sides
  6. 18. the number from which the subtrahend is subtracted
Down
  1. 1. a four-sided regular polygon
  2. 2. a quadrilateral with two parallel sides
  3. 3. a number to be divided by another number
  4. 4. the number to be subtracted from the minuend
  5. 6. a quantity obtained by multiplication
  6. 7. a parallelogram with four right angles
  7. 8. the number that remains after subtraction; the number that when added to the subtrahend gives the minuend
  8. 9. a quadrilateral whose opposite sides are both parallel and equal in length
  9. 11. the number obtained by division
  10. 13. the number by which a dividend is divided
  11. 16. a quantity obtained by the addition of a group of numbers
  12. 17. a number that is added to another number