Arithmetic words

1234567891011
Across
  1. 2. the word for this sign: -
  2. 5. the separate numbers in a multiplication
  3. 8. the distance from one number to the next
  4. 9. the word for this sign: +
  5. 11. the separate numbers in a sum
Down
  1. 1. doing minus (verb)
  2. 3. the title of the song about the order of operations
  3. 4. other word for division
  4. 6. doing plus (verb)
  5. 7. a multiplication
  6. 10. not an exercise, but an addition!