西师版一年级数学下册知识要点
西师版一年级下册数学知识要点一、100以内数的认识1.10个一是10;10个十是一百;100个一是一百。2.从右边起,第一位是个位,第二位是十位,第三位是百位。3.读数和写数,都从高位起。4.百位上写1,十位和个位都写0,是100,读作一百。5.读作写大写,写作写小写。6.十位上的数表示几个十,个位上的数表示几个一。7.数的顺序:按从小到大写数的顺序,先写出的数就是排在“前面”的数,后写的数就是排在“后面”的数。例如:29前面的数是28,29后面的数是30。8.比较两个数的大小:①三位数>两位数>一位数;②比较两个两位数的大小,先从十位比起,十位上的数大,这个数就大;十位上的数相同,就比个位上...
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