Thumbs up, thumbs sideways
Say a sentence aloud. Thumbs up for a fact, thumbs sideways for an opinion. "Dogs have four legs." "Dogs are cuter than cats." Ask "Can we check it?" every time.
Why it works: in a well-known study, a few short sessions of a simple number board game measurably boosted young children's number skills (Ramani and Siegler, 2008).
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