北京版數(shù)學(xué)二年級(jí)上冊(cè)《9的乘法口訣》

1、歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,北京版二年級(jí)數(shù)學(xué)上冊(cè),9的乘法口訣,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,學(xué)習(xí)目標(biāo)： 1. 使同學(xué)們學(xué)會(huì)9的乘法口訣。 2. 能夠熟記9的乘法口訣。,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,數(shù) 桃 子,199,2918,39,49,59,69,79,89,99,1個(gè)9,2個(gè)9,3個(gè)9,4個(gè)9,5個(gè)9,6個(gè)9,7個(gè)9,8個(gè)9,9個(gè)9,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!tha

2、nk you!thank you!thank you!,9 1 =,9 2 =,9 3 =,9 7 =,9 4 =,9 5 =,9 6 =,9 8 =,18,9,27,36,45,54,63,72,19 =,一九得九,二九十八,三九二十七,四九三十六,五九四十五,六九五十四,七九六十三,八九七十二,9的乘法口訣,9,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,9 1=,9 2=,9 3=,9 7=,9 4=,9 5=,9 6=,9 8=,18,9,27,36,45,54,63,72,一九得九,二九十八,三九二十七,四九三十六,五九四十五,

3、六九五十四,七九六十三,八九七十二,9的乘法口訣,99 =,81,九九八十一,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,9 1 =,9 2 =,9 3 =,9 7 =,9 4 =,9 5 =,9 6 =,9 8 =,18,9,27,36,45,54,63,72,一九得九,二九十八,三九二十七,四九三十六,五九四十五,六九五十四,七九六十三,八九七十二,9的乘法口訣,99 =,81,九九八十一,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,9 1 = ,9 2 = ,9 3 = ,9

4、7 = ,9 4 = ,9 5 = ,9 6 = ,9 8 = ,36,45,54,63,99 = ,72,81,9的乘法口訣,9,18,27,10 1,20 2,30 3,40 4,50 5,60 6,70 7,80 8,90 9,4,5,6,7,8,9,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,9 1 = 9,9 2 = 1 8,9 3 = 2 7,9 7 = 6 3,9 4 = 3 6,9 5 = 4 5,9 6 = 5 4,9 8 = 7 2,1,9,2,一九得九,八九七十二,九九八十一,9的乘法口訣,8,7,3,5,4,6,5

5、,6,3,2,7,4,99 =,81,九九八十一,8,1,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,9 1 =,9 2 =,9 3 =,9 7 =,9 4 =,9 5 =,9 6 =,9 8 =,18,9,27,36,45,54,63,72,一九得九,二九十八,三九二十七,四九三十六,五九四十五,六九五十四,七九六十三,八九七十二,9的乘法口訣,99 =,81,九九八十一,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,歸納,1. 9的乘法口訣有9句，每相鄰兩句口訣的得數(shù) 相差9。 2

6、. 9的9倍比90少9。也就是9和幾相乘就等于幾十減幾的差。 3. 積的十位數(shù)字與個(gè)位數(shù)字的和都是9。 4. 有幾句乘法口訣，積的個(gè)位和十位的數(shù)字相互交換了位置，比如，二九十八，九九八十一，18，81。,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,一九 _,9的乘法口訣,得九,二十七,四十五,十八,三十六,八十一,六 九,對(duì)口令,_ _ 五十四,三九_(tái),七九_(tái),二九 _,四九_(tái),八九_(tái),九九 _,五九_(tái),六十三,七十二,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,想口訣，積是幾。 9

7、 1= 9 4= 9 7= 9 2= 9 5= 9 8= 9 3= 9 6= 9 9=,9,36,63,18,45,72,27,54,81,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,94=,98=,95=,96=,99=,4=36,9= 72,9= 63,81,36,72,45,54,9,8,7,9=45,5,97=,63,花兒后面藏著誰(shuí)？,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,對(duì)不對(duì)？,59= ( 54 ) 54=( 6 )( 9 ) 49= ( 36 ) 79= ( 36 ) 39= ( 72) 89= ( 79 ),( ),( ),( ),45,( ),( ),( ),63,27,72,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you!,9的乘法口訣,910 = ,90,動(dòng)腦筋,？,歡迎來(lái)訪，敬請(qǐng)指導(dǎo)thank you!thank you!thank you!thank you