Algebra crossword

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Across
  1. 5. the answer to an addition problem
  2. 7. the bottom number in a fraction telling how many parts in one whole
  3. 9. the answer to a subtraction problem
  4. 13. the top number of a fraction meaning the number of parts
  5. 14. the answer to a multiplication problem
  6. 16. a mathematical sentence that balances
  7. 17. a letter that stands for a number
  8. 18. the father of algebra
  9. 19. a number that can be written as a fraction
Down
  1. 1. the distance a number is from zero
  2. 2. to unencumber the variable
  3. 3. a mathematical rule
  4. 4. the answer to a division problem
  5. 6. a constant number that a variable or expression is multiplied by
  6. 8. a combination of variables and numbers
  7. 10. the mathematical language of symbols and numbers
  8. 11. in a base, the number of times a number is multiplied by itself
  9. 12. a positive number that is not a fraction
  10. 15. a number that is not a fraction