How to use at least with a quantity?

Use at least to specify a minimum quantity.

For example, a phrase like this: At least one of us must stay here.
Solidify this grammar point right now
(you will be asked to create an account if you do not have one)

Learn more simple rules

Phrase the Cat inviting to practise English Phrase the Cat waving

At you can study grammar points and practise their application right away.