Study

18以內的加法

  •   0%
  •  0     0     0

      Back   Restart
  • 5 + 7
    12
  • 8 + 5
    13
  • 5 + 8
    13
  • 9 + 9
    18
  • 4 + 9
    13
  • 8+9
    17
    • Your experience on this site will be improved by allowing cookies.