Mathematical Crossword

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Across
  1. 3. Sum of all values divided by the total number of values
  2. 5. Numbers that have more than 2 factors
  3. 7. 100th part of a meter
  4. 8. Another word for addition
Down
  1. 1. Longest chord in a circle
  2. 2. The longest side of a right triangle
  3. 4. A closed two-dimensional figure with straight lines
  4. 6. Multiplication is also known as