Ash's puzzle

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Across
  1. 1. To plus two or more things
  2. 6. To plus things
  3. 8. To add things
  4. 9. To times things
Down
  1. 2. To divide things
  2. 3. To subtract things
  3. 4. A device to help find the answer
  4. 5. to multiply things
  5. 7. The answer to a question
  6. 9. To subtract things