we often use "yuan jiao fen " in one sentence or " kuai mao(fen can be omit, because all people know mao after kuai, fen after mao)" in one sentence, we do not often use "yuan mao" in one sentence. 70.00元====qi shi yuan(we don't say 00, It can be omit) 3.90元=====san yuan jiu mao（you are right, but we often say "san kuai jiu". all people know the figure after kuai that means mao. kuai=yuan） 1.25元=====yi yuan er mao wu fen (we alway say "yi kuai liangmao wu") 0.20元======liang mao //// can i just say liang （you can say "liang",you are right） 57.00元=====wu shi qi yuan er 10.10元=====yi shi yuan yi mao (shi kuai yi mao) 455.00元=====si bai wushi wu yuan 135.55元======yi bai san shi wu yuan wu mao wu fen ( you had better say “yi bai san shi wu kuai wumao wu or yi bai sanshi wuyuan wujiao wufen”) 269.40元====er bai liu shi jiu yuan si mao (er bai liu shi jiu yuan si jiao or er bai liu shi jiu kuai si) 783.70元====qi bai ba shi san yuan qi mao (qi bai ba shi san yuan qi jiao) 509.50元=====wu bai ling jiu yuan wu mao(wu bai ling jiu yuan wu jiao) 919.27元====jiu bai yi shi jiu yuan er mao qi fen (iu bai yi shi jiu yuan er jiao qi fen) 800.50元======ba bai yuan wu mao

really thanks so much!~

4th:"liang mao"are The spoken language .You can say:"er jiao". 5th wu shi qi yuan 6th "yi shi" are equal to "shi".notice:witch is the only first word. for example，12 shi er 212 er bai yi shi er, li is not that. The important problem "mao"is the spoken language .lf you want to use"yuan",then you should use "jiao"(角).They are formal words. The spoken language is "kuai (块)"and "mao". My english is very poor .l hope you can understand.