Find the number of groups
Distinguish a question about groups from a question about items. Explore a model, explain the relationship, and try it with physical materials.
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Distinguish a question about groups from a question about items. Explore a model, explain the relationship, and try it with physical materials.
Compare doubled jump size with halved jump count. Explore a model, explain the relationship, and try it with physical materials.
Relate a backward sequence to removing equal groups. Explore a model, explain the relationship, and try it with physical materials.
Explain a trail as accumulated equal addends. Explore a model, explain the relationship, and try it with physical materials.
State a rule that predicts a next total. Explore a model, explain the relationship, and try it with physical materials.
Recover a missing multiple without restarting the whole count. Explore a model, explain the relationship, and try it with physical materials.
Critique a numerical sequence with a local difference check. Explore a model, explain the relationship, and try it with physical materials.
Justify even and odd through complete pairs and a remainder. Explore a model, explain the relationship, and try it with physical materials.
Connect ten-column chart positions with number differences. Explore a model, explain the relationship, and try it with physical materials.
Interpret a product as a count of equal jumps. Explore a model, explain the relationship, and try it with physical materials.
Model an unknown-group problem with a trail. Explore a model, explain the relationship, and try it with physical materials.
Explain an invariant total under regrouping. Explore a model, explain the relationship, and try it with physical materials.