Numbers

1234567
Across
  1. 1. the first number to make a new number when flipped
  2. 2. there are blank, platonic solids
  3. 3. every polygon has at least __
  4. 4. the first number
  5. 7. we count in base blank.
Down
  1. 1. there are blank amount of days in a week
  2. 2. There are_ Letters with |&-cemetery
  3. 3. the first prime number
  4. 5. there are blank amount of planets
  5. 6. blank if you include Pluto