一年级上册上学期数学知识点归纳总结
一年级数学知识点归纳总结《加与减》知识点(一)十几减9、8、7、6等的减法1、一个一个地减:这个方法一般借助图形,减一个划一个。2、破十法:把十几分成十和几,先算10减去减数,结果再加上另一个数。例如:15-9,把15分成10和9,先用10-9=1,再用1+5=6就可以了。3、平十法:把减数分成两个数,其中一个数和十几的个位相同。例如:15-9,把9分成5和4,15减5等于10,10再减去4得出6就可以了。4、想加算减法:例如:15-9,想9加几得15,那么15减9就等于几。(二)解决多多少、少多少的问题1、看图列式,已知总数和去掉的一部分,求还剩下多少,用减法计算。2、比较两种物体的个数:求...
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