at least at most 在句子中的的位置.比如The girl is 7 at least .还是The girl is at least 7.

at most 和at least 都是介词短语,在句中做状语,修饰数量或程度的词语.
的确,一般说来,状语,尤其是表示方式的状语,往往出现在被它修饰的动词后,或干脆在句尾,如：
He spoke highly of his professor.
He does everything carefull.
但也有很多状语人们倾向于前置,尽管后置按语法也对,例如频率状语：
He often works late into night.
He is sometimes careliess.
at least 和 at least 就是这样的,放在它们所修饰的表示数词或程度的词语前.所以最为常用的词序应该是：
The girl is at least 7.
The pencil costs at most five yuan.
需要说明的是 --- 前面提到过 --- 换个词序在语法上还是允许的；而且,有时候为了强调,或加强状语的预期,说话者还故意把他们放到一个不同寻常的位置,如句尾：
The girl is 7 at least.
The pencil costs five yuan at most,