Mrs. Sorrentino's AMAZING crossword

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Across
  1. 1. an amazing subject
  2. 5. I'm not convinced this is an actual thing used in math
  3. 6. i learned this with a pizza!
  4. 9. something isn't adding up here
Down
  1. 2. something is adding up here
  2. 3. the new game on nytimes you like
  3. 4. a theatrical decoration on your wall
  4. 7. devika really likes this
  5. 8. The language of the universe