二年级上册数学知识学习认识时间与长度单位知识点
认识时间时和分1.1时=(60)分2.钟面上有(12)个数,这些数把钟面分成了(12)个相等的大格,每个大格又分成了(5)个相等的小格,钟面上一共有(60)个小格。3.钟面上有(2)根针,短粗一点的针叫(时)针,细长一点的针叫(分)针。分针走1小格是(1)分,走1大格是(5)分,时针走1大格是(1)时。分针从12走到6,走了(30)分;时针从12走到6,走了(6)小时;时针从12开始绕了一圈,又走回了12,走了(12)时。4.(30)分也可以说成半小时,(15)分也可以说成一刻钟。如8时30分是8时半,9时15分是9时一刻。5.(3或9)时整,钟面上时针和分针成直角。时间单位关系1.年地球围绕...
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