Numbers

12345678
Across
  1. 1. 2 lots of 3
  2. 3. this number is in the 1,3 and 9 times tables
  3. 4. the number that is double 2
  4. 5. the first two-digit number
  5. 6. the first square number
  6. 7. the second triangle number
Down
  1. 1. a prime number
  2. 2. the middle-most number (including positive and negative)
  3. 4. the number of fingers (and thumb) on a hand
  4. 5. the number of sides a triangle has
  5. 8. the only even square number