Math terms puzzle

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Across
  1. 3. A letter we use when we don't know the number
  2. 4. More than any finite (real) number
  3. 7. A polygon with 3 sides
  4. 8. Substitute for variable to make equation true
  5. 9. The top number or expression in a fraction
  6. 10. The size of a region in a 2D plane
  7. 12. The bottom number in a fraction
  8. 14. The answer to an addition problem
  9. 16. The answer to a division problem
  10. 17. Rewrite to mean the same thing but shorter
  11. 18. A standard measurement such as a meter or an hour
  12. 20. The opposite of a number (multiply by −1)
  13. 21. The answer to a subtraction problem
  14. 25. The answer to a multiplication problem
  15. 26. Two lines that never intersect
Down
  1. 1. number A value greater than zero
  2. 2. A numerator divided by a denominator
  3. 5. # of times the base is multiplied by itself
  4. 6. A number that a variable or expression can equal
  5. 11. The distance around a circle
  6. 13. A mathematical sentence with an equal sign
  7. 15. Find the solutions to an equation or problem
  8. 19. A length of about 39.37 inches
  9. 22. 1, 3, or 9, to 9
  10. 23. Variables and numbers using arithmetic
  11. 24. An expression that is used to compute a value