课件15张PPT。整十数加一位数及相应的减法30瓶我这里还有2瓶哦一共买了多少瓶呢?商店里30+2=?30+2=323个十和2个一合起来。怎么算32-2=呢?32-2=30304344303450 + 6 = 5635 - 5 = 30507575775075057575072042424420420242420420828288208202828208根据上图列算式并计算。90+8=
98-8=
20+3=
23-3=
1.看谁算得又对又快。70+6=
6+70=
30+7=
7+30=
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