How to implement tiered instruction in K-12 without slowing down the pace of the class

The biggest pitfall when doing tiered instruction in K-12 is splitting one lesson into three. I used to prepare three sets of materials for students at different levels, but I ended up constantly switching instructions during class. The fast students were waiting, the slow students were getting more anxious, and I was too busy to observe the real problems. Later, I switched to one task with…