Numbers

123456789101112131415161718
Across
  1. 2. Number of colours in the rainbow
  2. 5. XV is Roman numerals for this number
  3. 10. The sum of 2 to the power of 3
  4. 11. Number of years in 2 decades
  5. 15. Zero multiplied by 10
  6. 16. Number of eggs in a baker's dozen
  7. 18. Years of a Ruby wedding anniversary
Down
  1. 1. Lowest GCSE numerical grade
  2. 3. UK legal age to buy cigarettes
  3. 4. Number of major London airports multiplied by 10
  4. 6. Days in April
  5. 7. Maximum speed limit on a UK motorway (mph)
  6. 8. Number of hearts an octopus has
  7. 9. Number of sides on a nonagon
  8. 12. Number of players in 1 football team
  9. 13. Number of zeros in a trillion
  10. 14. Number of strings on a typical guitar
  11. 17. Number of hydrogen atoms in water