Arrange the numbers in descending order.
                               ,
                                                 ,
                                                                                      ,
                                                                    ,
                   12     ,     20    ,     16    ,     0     ,      5
               Arrange the numbers in ascending order.
                                                                  ,
                                                                                     ,
                             ,
                   10    ,    15     ,     6      ,     9     ,    14
                                               ,
               Start from the left, then color.
               The first
              The eighth
               At home: draw 3 sets of objects, what comes
               before, between, and next to.
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