Simplify the following text for a Grade 5 native English-speaking person.
Original: The number of points of each lettered tile is based on the letter 's frequency in standard English writing ; commonly used letters such as E or O are worth one point , while less common letters score higher , with Q and Z each worth 10 points .
Simplified: The common letters such as A , B , T , etc are worth one point . Unusual letters such as Q and Z are worth 10 points .