Nerdy Nerd's Puzzle 2.0

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Across
  1. 4. a reference to a problem or subject
  2. 5. symbols used in algebra
  3. 6. the clue won't fit on the board
  4. 8. the answer of a multiplication problem
  5. 11. the clue won't fit on the board
  6. 12. the opposite of multiplication
Down
  1. 1. the clue won't fit on the board
  2. 2. it is a phrase involving numbers
  3. 3. the answer to a division problem
  4. 7. the order inwhich a problem is solved
  5. 9. the value of a number based on its position
  6. 10. a factor that is able to change