Numbers

1234567
Across
  1. 1. Half a dozen
  2. 2. One less that 6
  3. 3. Tricycle wheels
  4. 4. First number
  5. 7. Five doubled
Down
  1. 1. Three and four
  2. 2. Corners on a square
  3. 3. Pair
  4. 5. - Legs on an octopus
  5. 6. - Three squared