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数东西
1 到 10
1 到 15
1 到 20
1 到 25
10 到 20
10 到 30
数东西做加法
(1~9) + 1
(1~9) + 2
(1~9) + (1~2)
(1~9) + 3
(1~9) + (1~3)
(1~9) + 4
(1~9) + (1~4)
(1~9) + 5
(1~9) + (1~5)
(1~9) + 6
(1~9) + (1~6)
(1~9) + 7
(1~9) + (1~7)
(1~9) + 8
(1~9) + (1~8)
(1~9) + 9
(1~9) + (1~9)
(1~9) + 10
(1~10) + (1~10)
数东西做减法
(1~5) - 1
(2~5) - 2
(3~5) - 3
(4~5) - 4
(5~9) - 5
(6~9) - 6
(7~9) - 7
(8~9) - 9
;