operation!

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Across
  1. 4. a letter that represents an unknown
  2. 6. your fabulous math teacher's last name
  3. 7. opposite of multiplication
  4. 8. getting the difference
  5. 9. the first operation performed
Down
  1. 1. gives you a product
  2. 2. basic procedures done in math
  3. 3. study of mathematical symbols
  4. 5. taking the sum