Math Challenge Crossword Puzzle

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Across
  1. 5. the answer of an addition problem
  2. 7. multiplying the same number over and over again
  3. 10. the opposite of a positive number
  4. 11. the inverse operation of addition
Down
  1. 1. a letter that represents an unknown number
  2. 2. the top part of the fraction of how many parts out of the whole
  3. 3. the answer of a division problem
  4. 4. your favorite math teacher
  5. 6. the acronym of each step to solve a word problem
  6. 8. a number sentence that has an equal sign
  7. 9. a comparison between two quantities