Why is the 多 in 每个月150个多小时 misplaced?
Think of 多 after a measure word as &quot;adding some more to the previous number, without making it to the next number&quot;.
5个多小时 = 5 hours plus some, but not quite 6 hours = between 5 and 6 hours
Note that 多 follows MW 个. It means between 五個小時 and 六個小時
150多个小时 = 150 hours plus some, but not quite 160 hours = between 150 and 160 hours
Here note that 多 follows MW 十 in 一百五十. It means between 一百五十個小時 and 一百六十個小時.
四块多美金 = between 4 and 5 USD
四十多块美金 = between 40 and 50 USD