Crossword puzzle

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Across
  1. 2. The arithmetic operation of repeated addition.
  2. 4. A mathematical notation indicating the number of times a base is multiplied by itself.
Down
  1. 1. The mathematical operation of splitting a number into equal parts. It is the inverse of multiplication.
  2. 3. A statistical measure that describes the relationship between two variables. It indicates how one variable moves in relation to another, often measured by a correlation coefficient.