doubles
  • 1. 1 + 1 =
  • 2. 2 + 2 =
  • 3. 3 + 3 =
  • 4. 4 + 4 =
  • 5. 5 + 5 =
  • 6. 6 + 6 =
  • 7. 7 + 7 =
  • 8. 8 + 8 =
  • 9. 9 + 9 =
  • 10. 10 + 10 =
  • 11. 1 + 1 =
  • 12. 2 + 2 =
  • 13. 3 + 3 =
  • 14. 4 + 4 =
  • 15. 5 + 5 =
  • 16. 6 + 6 =
  • 17. 7 + 7 =
  • 18. 8 + 8 =
  • 19. 9 + 9 =
  • 20. 10 + 10 =
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