《大九九乘法口诀表》背诵技巧
1、乘的乘法有1X111X221X331X441X551X661X771X881X991X10101X11111X12121X13131X14141X15151X16161X17171X18181X19192、乘的乘法有2X242X362X482X5102X6122X7142X8162X9182X10202X11222X12242X13262X14282X15302X16322X17342X18362X19383、乘的乘法有3X393X4123X5153X6183X7213X8243X9273X10303X11333X12363X13393X14423X15453X16483X17513X18543X19574、乘的乘法有4X4164X5204X6244X7284X8324X9364X10404X11444X12484X13524X14564X15604X16644X17684X18724X19765、乘的乘法有5X5255X6305X7355X8405X9455X10505X11555X12605X13655X14705X15755X16805X17855X18905X19956、乘的乘法有
f6X6366X7426X8486X9546X10606X11666X12726X13786X14846X15906X16966X171026X181086X191147、乘的乘法有7X7497X8567X9637X10707X11777X12847X13917X14987X151057X161127X171197X181267X191338、乘的乘法有8X8648X9728X10808X11888X12968X131048X141128X151208X161288X171368X181448X191529、乘的乘法有9X9819X10909X11999X121089X131179X141269X151359X161449X171539X181629X1917110、乘的乘法有10X1010010X1111010X1212010X1313010X1414010X1515010X1616010X1717010X1818010X1919011、乘的乘法有11X1112111X1213211X1314311X1415411X1516511X1617611X1718711X1819811X1920912、乘的乘法有12X1214412X1315612X1416812X1518012X1619212X1720412X1821612X1922813、乘的乘法有
f13X1316913X1418213X1519513X1620813X1722113X1823413X1924714、乘的乘法有14X1419614X1521014X1622414X1723814X1825214X1926615、乘的乘法有15X1522515X1624015X1725515X1827015X1928516、乘的乘法有16X1625616X1727216X1828816X1930417、乘的乘法有17X1728917X1830617X1932318、乘的乘法有18X1832418X1934219、乘的乘法有19X19361
孩子背的时候,会觉得第2段到第11段容易,第12段到第19段很难。背的时候,总是不自觉会用递加法,过一下就忘了。例如:16X17272,16X1827216288,如果前面的得数忘了,后面就背不出来了;得数加加数还容易混淆。抽背的时候就会背不出。
在19X19口诀表中,两个因数十位都是1,那么:
①当个位个位10,它们的积200个位X个位。例如:
f19X112009X1209
18X122008X2216
17X132007X3221
16X142006X4224
15X152005X5225
②当个位个位11,两数的积210个位X个位。例如:
19X122109X2218
18X132108X3224
17X142107X4238
16X152106X5240
③当个位个位12,两数的积220个位X个位。例如:
19X132209X3227
18X142208X4252
17X152207X5255
16X162206X6256
④当个位个位13,两数的积230个位X个位。例如:
19X142309X4266
r