Arithmetic words

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Across
  1. 3. the general word for plus, minus, times or divided by
  2. 5. the separate numbers in a multiplication
  3. 7. doing minus (verb)
  4. 9. other word for division
  5. 10. doing times
  6. 12. the word for this sign: -
  7. 13. not an exercise, but an addition!
Down
  1. 1. the separate numbers in a sum
  2. 2. doing plus (verb)
  3. 4. a multiplication
  4. 6. the distance from one number to the next
  5. 8. the title of the song about the order of operations
  6. 11. the word for this sign: +