[Blended learning] integrates face-to-face classroom time with online learning (facilitated at all times by a classroom teacher), combining the effectiveness and socialization of the classroom with technology-enhanced online materials.”
Grading formative assessments to measure students understanding makes little sense. They all learn in different ways and arrive at learning specific things at different times. To use formative assessment to grade a student is a misuse of the assessment. It is expected that some will get it others won’t, but that is for the teacher to understand and adjust accordingly. That is the purpose of formative assessment.