Numbers Fun

12345678910111213
Across
  1. 2. Two cubed.
  2. 4. First number.
  3. 7. Nothing at all.
  4. 8. Half a dozen.
  5. 9. Double one.
  6. 11. Divisible by one and itself.
  7. 13. Lucky number.
Down
  1. 1. Half of ten.
  2. 3. Double five.
  3. 5. Square of three.
  4. 6. Double two.
  5. 8. Total of numbers.
  6. 9. Triple one.
  7. 10. Not divisible by two.
  8. 12. Divisible by two.