Mr. Math's Crossword

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Across
  1. 3. sum of two or more numbers
  2. 5. part of a whole number
  3. 6. repeated addition
  4. 7. most common number
  5. 8. splitting into equal groups
  6. 9. difference between biggest and smallest number
Down
  1. 1. taking one number away from another
  2. 2. average of a number
  3. 4. a collection
  4. 6. middle number