Arithmetic words

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