Math Cross word

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Across
  1. 1. A symbol representing an unknown value in an equation
  2. 5. A method of repeated addition
  3. 6. A mathematical statement that two expressions are equal
  4. 8. A part of a whole, represented as a ratio of two numbers
  5. 9. Splitting a number into equal parts
Down
  1. 2. The process of combining two or more numbers
  2. 3. Whole numbers, positive or negative, including zero
  3. 4. The process of removing one number from another
  4. 6. A number that indicates how many times a base is multiplied by itself
  5. 7. The ratio of a circle's circumference to its diameter