填一填.
(1)16時(shí)30分是下午______時(shí)______分,下午3時(shí)是______時(shí).
(2)從9:O0到11:00,經(jīng)過(guò)了______時(shí).
(3)從10:O0到10:30,經(jīng)過(guò)了______分.
解:(1)16時(shí)-12時(shí)=4時(shí),
所以16時(shí)30分=下午4時(shí)30分;
3時(shí)+12時(shí)=15時(shí),
所以下午3時(shí)=15時(shí);
(2)11時(shí)-9時(shí)=2時(shí),
(3)10時(shí)30分-10時(shí)=30分,
故答案為:4,30,15,2,30.
分析:(1)24時(shí)計(jì)時(shí)法和普通計(jì)時(shí)法的轉(zhuǎn)化方法是:上午時(shí)刻不變,24時(shí)計(jì)時(shí)法的下午時(shí)刻=普通計(jì)時(shí)法下午時(shí)刻+12;由此得解.
(2)用結(jié)束時(shí)間-開(kāi)始時(shí)間,即可解答問(wèn)題.
點(diǎn)評(píng):(1)此題考查了計(jì)時(shí)法的轉(zhuǎn)化.上午時(shí)刻不變,24時(shí)計(jì)時(shí)法的下午時(shí)刻=普通計(jì)時(shí)法下午時(shí)刻+12;
(2)結(jié)束時(shí)間-開(kāi)始時(shí)間=經(jīng)過(guò)的時(shí)間.