A part with nothing in it

Practice on screen is rehearsal of naming an empty group and of putting zero in a bond. It supports, but cannot itself supply, the table-observed rows below. Your paper card remains the evidence record.

• Names the empty group as a part with zero: points and names it unprompted. After you trace the boundary, or supply the word “zero”, record supported. Accept “none” plus pointing — word-finding can mask the idea.
• Records 5, 5 and 0 against the actual groups: places or dictates all three. Needing the circles re-mapped to groups is supported; use numeral cards if writing is the obstacle.
• The whole stays five through the all-in-one move: recounts or cites the complete set. Your routine “how many?” is ordinary task delivery, not support.
• Transfer: builds the empty part with eight pegs, names 0 and 8, and sweeps both baskets. Excluding the empty basket from the whole, or reusing five, does not pass.

Mark each row independent / supported / revisit / uncertain. Leave anything you did not observe uncertain. Nothing is scored or stored.

There is no deadline. The group being asked about always carries the ★ badge, so “which part?” is never a guess. Zero is offered on every question about how many — sometimes it is the answer and sometimes it is not, so choosing it is always a real claim and never a trick.