Math and grammar words

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Across
  1. 2. a chart or graph etc.
  2. 4. to take away or remove
  3. 6. to question
  4. 9. the use of end marks
Down
  1. 1. factual information or numbers
  2. 2. to separate into parts
  3. 3. to increase the amount
  4. 5. a statement
  5. 7. to compute numbers to find their sum
  6. 8. same amount
  7. 9. a question to be solved
  8. 10. an amount or sum