C18 · Check which packs are complete
Fictional ordinary teaching source. Keep the worked response with adults/after-own teaching; it is never a preset for a held own response.
C18
Thirteen whole wheel-picture cards are available. Every complete pretend vehicle pack needs four cards. A supplied plan has three four-card packs and one loose card. A helper calls this four complete packs. How many packs are actually complete, and what remains aside?
Adult worked possibility · after own attempt
The loose card is not a fourth complete four-card pack. Name 13 as the whole available collection and 4 wheel-picture cards as the required size of each complete pack. Take exactly 4 at a time into a new named pack; check that size before calling it complete. There are 3 complete packs and 1 whole wheel-picture card aside. 4+4+4=12; 12+1=13. The requested number 3 names packs; 4 names members in one pack. A leftover group of fewer than 4 is not another complete pack. Count or rebuild all original members to check; repeated addition, known groups or a supported subtraction model are possible taught methods, not a required memorised division fact.