Count the ticks out loud
Hold up a thermometer image and model: "The labels go 20, 30, 40, and there are five spaces between, so each tick is 2 degrees." Then read the next one together. Most wrong answers come from assuming every tick is 1, and thinking aloud fixes that fast.
Why it works: handing over the work step by step, from teacher to student, is one of the most widely used teaching frameworks (Pearson and Gallagher, 1983).
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