Spanish numbers

123456789101112131415161718
Across
  1. 1. 20-8
  2. 3. 20-7
  3. 5. a septopus
  4. 7. 5+1
  5. 8. a octopus
  6. 10. the amount of fingers we have
  7. 11. 100-80
  8. 13. 20-2
  9. 14. 20-5
  10. 15. a boys 5th birthday
  11. 17. three of something
  12. 18. a pair
Down
  1. 2. 20-6
  2. 4. 20-3
  3. 6. 20-1
  4. 9. 20-9
  5. 12. first
  6. 13. 20-4
  7. 16. the amount of legs a dog has