五一即将到来 Fifty-one upcoming

从周一到周五上学 Monday to Friday from school ; go to school from Monday to Friday

他从五岁一直游到现在 He has five tour now

在周末/在周一到周五 at the weekends/on the weekdays

从周一到周五 from Monday to Friday ; m-f

四舍五入到单一的精度 RSP

初一到十五 from the first day to the fifth day

五百万到一千万 five to ten million kinds

由一星到五星不等 Weak Foot