Math Spelling, WHAT!

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Across
  1. 2. times.
  2. 4. the sum of 20 and 10.
  3. 5. to combine numbers.
  4. 10. the answer to an addition problem.
  5. 11. you do this to find a product.
  6. 12. the solution to a math problem.
  7. 14. the answer to a multiplication problem.
  8. 15. LxW.
Down
  1. 1. how tall is it?
  2. 3. after 7.
  3. 6. the bottom number of a fraction.
  4. 7. when you have this you need a solution.
  5. 8. you can see through it.
  6. 9. how wide it is.
  7. 13. all right angles, all sides the same.