I use these practice sheets with my students to give them practice writing the word families that are taught in letterland. The sorting activity covers previously taught word families, so the students are consistently reviewing what we have already learned.
Since using these practice sheets in my classroom, I am noticing that more of my students are retaining the taught spelling pattern. It is also increasing their awareness of the chunks in their reading and writing.
I use this in class, but it could also be a really great homework review sheet.