Spelling word crossword puzzle

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Across
  1. 3. divide into parts
  2. 5. the opposite of addition
  3. 7. a stopping place
  4. 8. something that has been invented
  5. 9. a liquid poison
  6. 10. separating something into parts
Down
  1. 1. learning that happens in school
  2. 2. the answer to a problem
  3. 4. the opposite of subtraction
  4. 6. lack of understanding