Funny maths

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Across
  1. 2. numbers that accumulate —> adition
  2. 6. coordinate that is used, with the ordinate,
  3. 7. unknown is a constituent element of a question of the same nature as an equation —> unknown
  4. 9. that determine the position of a point
  5. 10. of a division. —> quotient
Down
  1. 1. the position of a point in a plane. —> abcissa
  2. 2. an algebraic expression in the form of a sum or a difference into a form of a product. —> factorize
  3. 3. coordinate used to define the position of a point. —> ordinateur
  4. 4. operation that increases a result —> multiplication
  5. 5. a reference system, in a plane or in space —>
  6. 8. of the constituent elements of a product —> factor