如何让孩子明白2+3与3+2是一样的
孩子一直整不明白23与32是一样的,告诉他好多次,当先提问完23=5后,再提问32,他还得用手指头算半天。 我决定让孩子明白这个道理,首先,我告诉他23与32是一样的。然后让他在纸上写出23=5与32=5,告诉他,你看,3与2只是调换了下位置,但结果是一样的。 孩
孩子一直整不明白2+3与3+2是一样的,告诉他好多次,当先提问完2+3=5后,再提问3+2,他还得用手指头算半天。
我决定让孩子明白这个道理,首先,我告诉他2+3与3+2是一样的。然后让他在纸上写出2+3=5与3+2=5,告诉他,你看,3与2只是调换了下位置,但结果是一样的。
孩子点点头表示明白了,然后,我要求他当我提问2+3时,他要回答“2+3= 5”然后再颠倒回来说“3+2=5”,效果不是很理想。我退一步要求他,我提问2+3时,他回答3+2,他就是让他反过来说,他基本上能回答上来,其它组合也可以。
但是,当我提问1+1,或类似这样的问题时,他就不知道怎么说了。我再简化下,我要求,我说23,他回答32,基本上他能正确回答,但问11时,他不能回答了。
我要求他在纸上写出我说的数,比如我说12,他写下12,然后让他用笔先从前向后点,读1,2,然后,再从后向前点,读2,1。
好,按此方法,我开始了以下测试,
123,234,125,345,984
112,221,334
他都能正确的按要求做出来,最后,我说
11,
他犹豫了下,我让他用笔点,他先从前向后点,读1,1,然后,再从后向前点,读1,1。
OK,这下他明白了。
再训练反复说1+1,顺利通过。
然后训练其它的组合,如2+2,3+4等等,顺利通过。
再要求孩子我提问2+3时,他要回答“2+3=5”然后再颠倒回来说“3+2=5”,类似这样的组合基本上第一次算时他要费时间,但第二次他能很快回答上来。
现在孩子已经基本理解了,比如你问他2+8,他认为这样不好算,他就会用8+2算结果了。

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