二年级数学上册需背记的重点公式口诀汇总
二年级数学上册需背记的重点公式口诀汇总1、要知道物体的长度可以用(尺子)来测量,我们学过的长度单位有(厘米)、(米)。测量橡皮的长度可以用(厘米)作单位,测量操场的长度可以用(米)作单位。2、测量物体时般把尺子的(0刻度)对往物体的(左端)。物体一端对着3厘米,另一端对着8厘米,则物体长度为(5厘米)【大数减小数】3、1米=100厘米 200厘米=2米1米30厘米=130厘米320厘米=3米20厘米4、最大的一位数是9,最大的两位数是99,最小的两位数是10,最小的三位数是100.最大的两位数和最小的两位数的差是(89),和是(109)。5、从右边起,第一位是(个位),第二位是(十位),第三位...
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