分数的意义
把看做“1”2个“1”是24个“1”是4
1米
把看着单位“1”···5················3·······························1······························
把看着单位“1”······()····························()····························()41
把看着单位“1”1米······()··························()···························()31
把看着单位“1”····················()·······()···················()21
01单位“1”23平均分成若干份,这样的一份或几份都可以用分数表示
23
()1234612
把单位“1”平均分成若干份,表示其中一份的数叫分数单位。