Words with FRIENDS!

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Across
  1. 3. be the same
  2. 4. put together
  3. 7. times
  4. 9. multiply
Down
  1. 1. take away
  2. 2. quantity or amount
  3. 4. number added to another
  4. 5. by
  5. 6. addition sign
  6. 8. subtraction sign