Word study crossword

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Across
  1. 3. a symbol to stand in for a number
  2. 5. make smaller
  3. 8. the plural of vertex
  4. 10. two expressions that are the same
  5. 12. a expression is algebra
Down
  1. 1. two fractions that are the same
  2. 2. the relation between two amounts
  3. 4. to find the answer
  4. 6. two rations that are the same
  5. 7. each angular point of a figure
  6. 9. The act of replacing something with another thing
  7. 11. make bigger