So she is not sending home the regular Envision sheets, just these random internet sheets? Are they doing the Envision homework in class?

I just got a group email from DS's 6th grade math teacher complaining about how some kids do not yet know their math facts and since they are now doing long multiplication and divison with decimals, these kids are struggling. She told parents to make sure the kids are working on fluency. So maybe these practice sheets are supposed to be extra practice for those kids who are not fluent?