人教版數(shù)學(xué)一下《整十?dāng)?shù)加、減整十?dāng)?shù)》湖北王蕓老師-教學(xué)設(shè)計(jì)-一年級(jí)數(shù)學(xué)教案

121?§ê±

1?ì?§??±ê.

1?￠??ó??±1??ì?§ê???,°??ú?§éúàí?aoí??????ê?êy?ó????ê?êyμ?????·?·¨?￡

2?￠′′éè?é?3,???§éú×??÷ì??÷?￠o?×÷??á÷μ??§?°?????￡?¤·￠?§éúμ??§?°D?è¤,?à???§éúμ?o?×÷òaê?oíêμ?ù?üá|?￡

3?￠?à???§éú1?2ì?￠·???oí?a???êìaμ??üá|?￡

2?§?é·???.

?§éú?ú?°??ò??????á?100ò??úêyμ?×é3é;ò??°??ê?êy?ó??ò???êyμ???·¨,í¨1y??ê±μ?1?2ìoíá??a,?aμào￠×ó?????a2?·??aê?????μ??1±è??o?,′ó2?·??§éúóD×??÷?§?°μ??üá|?￡

3?ì?§????μ?.

??μ?:ê???????ê?êy?ó??μ??ú??·?·¨?￡??μ?:ê?àí?a??ê?êy?ó???ú??μ???àí?￡(1)?￠?ü?yè·μ???????ê?êy?ó????ê?êyê???μ??￡(2)?￠ì????￠àí?aoí??????ê?êy?ó????ê?êyμ?????·?·¨ê???μ??￡

4?ì?§1y3ì.

4.1μúò??§ê±

4.1.1?ì?§???ˉ.

???ˉ1??μ?è???￡¨ò?￡??′?°?é?a.

1?￠?ú??(???t3?ê??ú??ìa)

2?￠ì???:(1)30à???óD(

)??ê?

(2)7??ê?ê?(

)

(3)80à???óD(

)??ê?

(4)56à???óD(

)??ê?oí(

)??ò?

3?￠?μò??μ,?ò???§1yá???D???ê?êy?

???ˉ2???2êú??￡¨?t￡?ì???D??a.

(ì??°òyè?)??ìì?ò???§?°μ?D??aê?ê?:????ê?êy?ó?￠????ê?êy?·?￡

(°?êé?￠????ê?êy?ó?￠????ê?êy?·?￡è??§éú???á??ìa)

1?￠ê×?è?ò???§?°?°??ê?êy?ó??ê?êy?±

(1)?￠′ò?a??±?P61?÷ìaí?:

(2)?￠òyμ?è??§éú×D??1?2ì?￡

1)?￠?ê:????·￠??á?ê2?′?

(à?ê|?ú·￠êé;×à×óé?:×ó±?·?×?10±?,óò±?·?×?20±?)

2)?￠?ê:???üìá3?ò???êy?§?êìa?e?

(éúì????￠?ùê???′e?êìa)

?§éú?μ3?:ò?12óD?àéù±?êé?(±?òaê±?éò?òyμ??μ3??°?óò?12?àéù±?êé?±)

3)?￠?ê:???′??ü?a′e??μ??êìa?

?§éú?ú′e:10+20=30

(2)?￠(12í?ì????°??ê?êy?ó??ê?êy?±μ??ú??·?·¨)

1)?￠?ê:10+20=30??ò???,??ê????′??μ??

2)?￠?§éú??′e:(?§éú±???′eà?ê|±??2?a2?í?·?·¨,2￠?òμ￥°?êé)

è?°à??á÷?￡

3)?￠°?êé:

·?·¨ò?:?éò?ó?D?°?°úò?°ú,μ?3??á1?

(??μ??§éú?ˉê?2ù×÷?ò3?ê?°úD?°?í?)?￡

?è°ú1à|(10?ù),±íê?×ó±?êéμ?±?êy;

?ù°ú2à|(??à|10?ù),±íê?óò±?êéμ?±?êy;

o??eà′ê?3à|D?°?,3à|ê?30?ù,?ùò?,10+20=30

·?·¨?t:?ó×?êyμ?·?·¨,?±?óêy3?μ?êy?￡

(êyμ?ê±oò,°′??10???￠10??μ?êy?￡10?￠20?￠30;?ùò?,10+20=30

·?·¨èy:?éò?????3?μ?êy?￡òò?a,10à???óD1??ê?;20à???óD2??ê?;1??ê??ó2??ê?ê?3??ê?,3??ê?ê?30.?ùò?10+20=30

(1?à??§éú?à?μò??μ??àí)

·?·¨??:?éò?ó???êy?÷à′????.(ò??°ê??±?aμ￥??μ?êy?à?óμ?·?·¨)?￡(10+20,°?ê???é?μ?êy?à?ó,????é?μ??°0?±2?±?)

òò?a1+2=3?ùò?10+20=30

??μ÷:?àí?μ￥??2??ü?±?ó?à?ó

2?￠?ò???ùà′?§?°?°??ê?êy????ê?êy?±

(1)?￠?ê:?èè??ò???§?°á??a?′?à·?·¨à′?a???ó·¨ìa,

???′30-20=?

???ù??μ??

?§éú??′e·?·¨?￡(òyμ??§éúó??°??àí?±μ?·?·¨à′????:3??ê???2??ê?μ?1??ê?,ê?10,?ùò?,30-20=10)

(2)?￠???′í??§?????2??ê2?′·?·¨???

?§éú?ùê???′e?￡

???ˉ3??á·?°??￡¨èy￡?1?1ì?μá·.

1?￠íê3éP62μ??°×?ò?×??±

μú1ìa:?′í??ú??(éú?àá￠íê3é?￠??±¨?á1?,?????μ?μ?ú??μ?·?·¨)

μú2ìa:(éú?àá￠íê3é?￠??±¨?á1?)?′?×?μ?óD??ó??ì?￡(è?oó?2êó?￠?ü?y?￠??á÷)

???ˉ4?????ˉ??￡¨??￡???ì?×ü?á.

??ìì???§á?ê2?′?

?§?áá?????ê?êy?ó????ê?êy?·μ?????·?·¨,?íê?°?????ê?oí????ê??à?ó?￠?à??,??ê?°?ò?ê??aμ￥??μ?êy?à?ó?￠?à???í

???ˉ5??×÷òμ??￡¨??￡?×÷òμéè??.

á·?°ê???μú1ìaoí2ìa

???ˉ6???2êú??￡¨áù￡?°?êééè??.

??ê?êy?ó?￠????ê?êy

10+20=30

(1)1??ê??ó2??ê??a3??ê?,?ùò?ê?30

(2)òò?a1+2=3?ùò?10+20=30

?á??:?àí?μ￥??2??ü?±?ó?à?ó?ò?à??

???ˉ7?????ˉ??￡¨??￡??ì?§·′??.

????ê?êy?ó,????ê?êy?·?a?ú??ê?è??ì°?ò??ê????2áμúáùμ￥?aμ?μúò???ê±,?a2?·?μ?????ê??ú10ò??ú?ó?￠??·¨μ??ù′?é???DD?§?°μ??￡?üê?á???êy????μ??eê???,ê??§éú??DD100ò??ú?ó??·¨μ??ù′?,?ùò?±??ú??ê??????ì?§?Dμ???μ??úèY??ò??￡

±?×?è?ò??ê?????????ü??êμD§D??aò???ò,?ò??±??ú????DDá???D?μ?éè???￡±???μ??ì?§éè??′óì?·?????2?′?:μúò?,éè??êêμ±μ??′?°??DD?aê??ìμ?,μú?tò?êμ?ê?é?3ìá1?????ìa,3ê???à??????·?·¨2￠??ó??ˉ??·¨?￡μúèy,è??§éúì???,?ˉê?2ù×÷,àí?aoí??????·¨?￡μú??,í?à??±1?ê???,è??§éú??????·¨,??3?μ?êy?￡

′ó?§éúμ?μ±ì??ì2aà′?′,?yè·?ê′?μ?

90

%ò?é?,?§éú????ê?êy?ó????ê?êyμ?????·?·¨????μ?±è??o??￡

′ó?§éúμ?2?ó?3ì?èà′?′,ó??a???ˉ?á2????′ì¨?aò??§?°?é?3?§éú??±è???2??,?ùò????ü????1?2ì?????￠·￠??D??￠?￠ìá3??êìa?￠?a???êìa,?ò2?ó?ì???μ?D?è¤oíó?í?±è???¨?￡

2?×?:±??ú??,??óú?§éúà′?μê?oü?òμ￥μ?ò??ú??,?ú?2ê