Mathematics

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Across
  1. 3. the process or skill of calculating the total of two or more numbers or amounts.
  2. 5. something that is the opposite or reverse of something else.
  3. 6. is a quantity produced by the division of two numbers.
Down
  1. 1. arranged in or extending along a straight or nearly straight line.
  2. 2. the action of separating something into parts or the process of being separated.
  3. 4. is a polygon with three edges and three vertices.