/ Place Value StudioTHE PLACE VALUE MISSIONS · GRADES 2–3
Big thinking. Small cubes.
Pack, trade, and prove that every cube counts.
Which move gets this model ready for the goal above?
How did that feel?
ROUTE COMPLETE
You explained six deliveries. Choose one to replay, or open the Studio to build a problem of your own.
One more question to discuss: when does a calculation need a trade in this model, and when can its arrangement stay?
Grades 2–3 · visual number lab
Make regrouping visible with exact tens-and-ones models for addition and subtraction within 100.
Sketch both addends with tens and ones. Look for an exchange.
Inspect one fair exchange
This tray isolates one ten from the model above. Change its arrangement; keep every unit.
Use these as a short sequence: contrast no exchange with exchange, then contrast no trade with trade.
The Studio works immediately in a current browser with no sign-in and asks for no student information. “Print task” prints only the student prompt and workspace; the answer and teacher notes stay off the printout. Projector view enlarges the lesson area without asking the browser for full-screen permission.
