Useful outcome: Tie every twos count to one full pair and the cumulative object quantity.
Prepare: Seven pairs/fourteen marks to model, one extra pair, twenty marks and a blank count strip. Do not supply a completed answer strip during the own attempt.
Notice · 3 minutes
Return to one actual pair. Ask what it is worth. Add a second pair and ask whether the quantity grew by one object or two. Invite pointing, numeral selection, sign or speech.
Model · 5 minutes
Count seven verified pairs as 2,4,6,8,10,12,14. Add a full pair; the new final count is 16. Contrast adding one object: that would make 15 and leave an incomplete pair. The comparison concerns object change; no formal division rule is needed.
Guided attempt · 8 minutes
Use twenty marks as ten pairs. The child counts each pair as the teacher points once. Deliberately pause after three pairs and ask how many objects are included so far:6. Restart only if needed; otherwise continue 8 through 20. Do not treat a fluent spoken list unlinked to pairs as quantity evidence.
Own choice · 6 minutes
Choose one route; the child selects/directs the mathematical action. A different route is available later.
Route A · Decoration order
Child task: Choose pair positions for twenty large paper-decoration marks and count the objects.
Teacher move: Place a marker by the pair the child is counting, without naming the next count.
Observe: Each step names two more actual objects; twenty is the last included count.
Next move: If recital outruns pointing, reduce to six pairs and link one count to each, then try a new set.
Route B · Quiet footprint sketch
Child task: Match 2,4,6,8,10,12,14 to fourteen paired footprint-like symbols. No walking is needed.
Teacher move: Ask which pair makes the count 6 true.
Observe: Cumulative labels connect to the first three pairs; not a label on one six-object pair.
Next move: If labels shift one pair, anchor the first pair at 2, rebuild the next two, then fresh labels.
Route C · Finish the tray
Child task: Sixteen marks are partly paired. Finish the grouping and count all the objects.
Teacher move: Leave the loose marks for the child to place/direct, then ask what the last count includes.
Observe: Eight equal pairs; all sixteen included; child completes membership.
Next move: If one group has three and another one, audit these groups and redistribute before a new count.
Exit and same-day next teaching · 3 minutes
Five pairs are present. Someone says the last twos count is 8. Show what their account missed.
Teaching reference: Five pairs contain 10;8 counts only four pairs, leaving one pair.
Choose next: A missed pair needs a coverage routine; a known count list without quantities needs one full pair per step. Keep response speed out of the decision.
Retain the first response, actual range and support; a later corrected or adult-supplied model is a separate record.