Math Crossword

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Across
  1. 7. Math robot 9000.
  2. 8. The circumference of the most simplest yet hardest to draw shape.
  3. 9. You kinda have to go to learn.
  4. 10. Subtract stuff with this.
  5. 12. Not a number, just an expression. (:
  6. 15. The thing with the words.
  7. 16. Add stuff with this.
Down
  1. 1. Multiply stuff with this.
  2. 2. I always thought it was useless.
  3. 3. Divide stuff with this.
  4. 4. Your worst nightmare.
  5. 5. The thing that's short but is worth an unreasonable amount of your grade.
  6. 6. Why are these in math again?
  7. 11. That's a lot of zeros.
  8. 13. The thing that's long and is worth a lot of your grade.
  9. 14. The simplest number.