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