背完你的英语就差不多了，7天搞定3500基础词

十五、数词（24个） first  one second   two third  three fourth   four fifth   five sixth   six seventh  seven eighth  eight ninth   nine tenth  ten eleventh eleven twelfth twelve thirteenth thirteen fourteenth thirteen fifteenth thirteen sixteenth sixteen seventeenth seventeen eighteenth eighteen nineteenth nineteen twentieth twenty twenty-first twenty-one twenty-second twenty-two thirtieth  thirty one hundredth  hundred ……