Math AND Social Studies! *GASP*

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Across
  1. 3. A model or other visual representation of a math problem
  2. 6. To give or add to
  3. 7. To make official. (Hint: This word is in two of the other clues for this puzzle)
  4. 9. It equals length x width x height
  5. 10. Someone who DID'T want to ratify the Constitution unless it had a bill of rights
  6. 12. Someone who DID want to ratify the Constitution
  7. 13. A team working together, an alliance
  8. 15. The most important thought of a text
Down
  1. 1. To come to an agreement after a conflict
  2. 2. To notice differences and similarities
  3. 4. Anti-federalists wanted a bill of right to protect the _______ of the United States
  4. 5. A magical creature that lives on Corrine's island
  5. 8. A fight or argument, a problem
  6. 11. A value made up of equal sized parts of a whole
  7. 14. You can find volume by multiplying _____ x height
  8. 16. An operation where a number is split into equal sized groups or parts