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14 Cards in this Set

  • Front
  • Back
SRU
Separate Result Unknown
JRU
Join Result Unkown
SCU
Separate Change Unknown
Direct Modeling

Trial and Error
An initial set of objects is constructed. A set of a given number of objects is added to or removed, and the resulting set is counted. If the final count is accurate, then the number of objects in the initial set is the answer. If it is not, then the initial set is changed until the desired outcome is achieved.
Direct Modeling

Matching
Two different sets of objects are constructed. The sets are matched one-to-one until one set is used up. The answer is the number of unmatched objects remaining.
Direct Modeling

Matching
Two different sets of objects are constructed. The sets are matched one-to-one until one set is used up. The answer is the number of unmatched objects remaining.
Direct Modeling

Separating To
A set of objects is counted out. Objects are removed from it until the number of objects remaining is the desired outcome, the answer being the number of objects removed.
JSU
Join Start Unknown
Direct Modeling

Joining To
A set of objects is constructed. Objects are added until arriving at the desired outcome, the answer being the number of objects added.
Direct Modeling

Joining All
Using objects or fingers, two sets of objects are joined and counted.
SSU
Separate Start Unknown
JCU
Join Change Unkown
Direct Modeling

Separating From
Using objects or fingers, a set of objects is constructed. Some objects are removed, the answer being the number of remaining objects.
Direct Modeling

Separating From
Using objects or fingers, a set of objects is constructed. Some objects are removed, the answer being the number of remaining objects.