Crossword puzzle math

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Across
  1. 2. The number of degrees in a right angle. (5 letters)
  2. 5. What's the total if you add 5 and 7? (5 letters)
  3. 9. The answer to a subtraction problem. (8 letters)
  4. 10. A shape with all sides equal and three angles. (5 letters)
Down
  1. 1. The distance around a circle. (4 letters)
  2. 3. The result of multiplying numbers. (8 letters)
  3. 4. The number that comes after 999. (4 letters)
  4. 6. A number that has only two factors: 1 and itself. (4 letters)
  5. 7. A four-sided shape with four right angles. (10 letters)
  6. 8. A number divided by itself (except zero) equals this. (3 letters)