Explain an unknown part
Connect an unknown addend with a subtraction relationship. Explore a model, explain the relationship, and try it with physical materials.
450 lesson drafts and nine original starter guides. Explore number relationships, fractions, sorting, patterns, shapes, and more. Try three complete free sample lessons. A paid adult account opens all teaching guides, printable PDFs, and learning tools.
Choose by readiness and prior teaching. Grade labels are starting points. How to choose a starting point
Showing 349–360
Connect an unknown addend with a subtraction relationship. Explore a model, explain the relationship, and try it with physical materials.
Defend equality across different arrangements. Explore a model, explain the relationship, and try it with physical materials.
Explain regrouped and ungrouped views of a teen quantity. Explore a model, explain the relationship, and try it with physical materials.
Justify a difference with a concrete part-whole model. Explore a model, explain the relationship, and try it with physical materials.
Explain why moving units preserves the value of a sum. Explore a model, explain the relationship, and try it with physical materials.
Justify a near-double strategy as a change from a known sum. Explore a model, explain the relationship, and try it with physical materials.
Distinguish a correct count from a relevant answer. Explore a model, explain the relationship, and try it with physical materials.
Use unmatched units to defend a difference. Explore a model, explain the relationship, and try it with physical materials.
Find the missing part to ten using a structured frame of two rows of five.
Recognize a row as one small group. Explore a model, explain the relationship, and try it with physical materials.
Compare equal groups with a deliberately unequal physical set. Explore a model, explain the relationship, and try it with physical materials.
Notice that turning preserves the number of objects. Explore a model, explain the relationship, and try it with physical materials.