北师大版 三年级下册 第三单元 乘法
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序言
14
12
×
28
······14×2
140
+
168
······14×10
······28+140
14
21
23
×
34
12
×
33
13
×
1.同学们进行体操表演,每排13人,有12排,一共 有多少人? ⑴ 用竖式计算。 ⑵ 圈一圈,并说一说 竖式每一步的意思。
2.
32
13
×
34
21