冀教版二年级上册数学知识点必会
第一单元 : 观察物体 1.通过观察活动,体验站在不同的位置观察物体,看到的形状可能是不同的。 2.我能辨认一个立体实物从前面、侧面和上面所看到的平面图形。 3.球体从哪一个面看到的都是(球形).4.正方体,每个面看到的都是(正方形) 5.长方体,每个面都是(长方形),但是有时候有两个面可以是(正方形).6.(正方形)是特殊的长方形.第二单元 :加减混合运算 1.连加、连减的笔算顺序和连加、连减的口算顺序一样,都是(从左往右)依次计算。3.在一个算式里,如果有小括号,要先算小括号里面的。 4.加、减法估算:在日常生活中有些情况不需要进行精确计算,只是算出大致的结果就可以了在这种情况下就需要估...
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