Master difficult crossword

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Across
  1. 1. add number however it is a prep.
  2. 5. a specific number that has a numerator and a denominator.
  3. 6. a measure of an angle.
  4. 9. to find a solution.
  5. 10. the absolutely straight line up to down.
  6. 11. the information you got it after some researches or experiments.
  7. 13. the absolutely straight line left to right.
  8. 14. double check the answer you got.
Down
  1. 1. the number you got it after doing a multiplication.
  2. 2. the whole length of the line of an object.
  3. 3. the product of length and width which is the amount of place of the surface.
  4. 4. the number you got it after doing a subtraction.
  5. 7. to calculate a number
  6. 8. make the number as simple as possible.
  7. 12. add number however it is a verb.