小学数词ppt

Whenisyourbirthday?基数词变序数词知识JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember月份构成小口诀一月、二月uary,三月、五月March,May四月里面有“A，i”（April）六月、七月June,July八月August九月、十一月、十二月ember十月单独记October.基数词构成小口诀(表示数量的数词)1、1-12单独记（one---twelve）2、13-19结尾teen(重音在后)3、20-90整十结尾是ty.4、21-99（几十几）十位个位连字符（twenty-one）5、hundred百，thousand千，million百万，billion十亿6、百，千，百万，十亿（表准数无s）（表概数有s加of）eg.twothousandboys/thousandsofboys7、百位后加and，十位个位连字符eg.twohundredandtwenty-twofirst1stsecond2ndthird3rdfourth4thfifth5thsixth6thseventh7theighth8thninth9thtenth10theleventh11thtwelfth12ththirteenth13thfourteenth14thfifteenth15thsixteenth16thseventeenth17theighteenth18thnineteenth19thtwentieth20thtwenty-first(21st)twenty-second(22nd)twenty-third(23rd)twenty-fourth(24th)twenty-fifth(25th)twenty-sixth(26th)twenty-seventh(27th)twenty-eighth(28th)twenty-ninth(29th)Thirtieth(30th)thirty-first(31st)2aListenandrepeat.基变序的口诀：基变序有规律，末尾加上th,1、2、3尾t、d、d(first,second,third,)8去t，9去e，(eighth,ninth)f要把ve替，(fifth,twelfth,)ty(几十)结尾y变i，加e再加th.(twentieth,ninetieth)若是遇到几十几，只变个位就可以.(twenty-first)8月26月129月204月910月191月31-What’sthedate?-It’s…