Whole Group Discussion
During Live Investigation and Task sessions (both teacher-led), I often use a whole group discussion format just like a traditional classroom. Blended or not, there is no substitute for discussion.
During Personalized Small Group Instruction, I work closely with a small group of students while other students are engaging in activities independently at different stations. Based on my learning objective, I group my students differently for Small Group Instruction every day. Sometimes students are grouped homogeneously, according to specific needs, and sometimes they are grouped heterogeneously. This strategy, which is enabled by my station rotation blended model, allows me to spend individual time with each student on a regular basis.
During an Independent Learning Zone session, every student in my blended classroom is working independently on a different set of problems. It's impossible for me to be an answer key for 25 different students doing 25 different problem sets, so I print out their respective answer keys in advance and give each student his or her about 5-10 minutes into the period. This empowers them to monitor their own academic performance and self-correct as they are completing their assigned task.
Anytime I can bring a student up for a demonstration it usually captures the other students' attention much more than I do. Having a physical connection can help with internalizing the mathematics.