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第2课时时间的换算,第一单元时、分、秒,一、想一想,,,填一填。,3,时,(,),分,120,秒,(,),分,2,分,20,秒,(,),秒,180,60,3,2,60,2,140,60,2,140,二、在括号里填上合适的数。,3,分,(,),秒,5,时,(,),分,360,秒,(,),分,240,分,(,),时,100,秒,(,),分,(,),秒,3,时,30,分,(,),分,180,300,6,4,1,40,210,三、在里填上“”,“,”或“”。,8,分,80,秒,2,时,10,分,130,分,2,时,200,分,1,分,15,秒,80,秒,150,秒,3,分,1,时,20,分,120,分,四、我会判断。,(,对的画“”,错的画“,”,),五、选一选。,(,将正确答案的序号填在括号里,),1,.,煮一锅饭需用半小时,也就是,(,),。,A,.,60,分,B.30,分,C.20,分,2,.,刘师傅,8,分钟能加工,1,个零件,他,1,小时,4,分钟能加工,(,),个零件。,A,.,3 B.4 C.8,B,C,3,.,游,100,米,小刚用了,80,秒,小林用了,1,分,15,秒,小超用了,110,秒,,(,),游得最快。,A,.,小刚,B.,小林,C.,小超,B,六、,乐乐准备将一根绳子剪成长度相等的,10,段。若每剪一次需要,7,秒,,1,分能剪好吗?,10,1,9(,次,),79,63(,秒,),63,秒,1,分,答,:,1,分钟不能剪好。,
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