Math Crossword puzzle

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Across
  1. 2. numbers that have more than two factors
  2. 6. to split a number into equal groups
  3. 7. to find the difference of numbers
  4. 8. the answer to a multiplication problem
Down
  1. 1. to find the sum of numbers
  2. 3. repeated addition
  3. 4. numbers that have exactly two factors
  4. 5. the numbers that are multiplied together