To earn full points on the Open-Ended questions on Pennsylvania's assessment tests (the PSSAs), you have to provide satisfactory explanations for your answers.
From the Grades 3-6 PSSA Released Practice Items:
Marco cut his cake into 8 equal pieces. Nikki cut her cake into 16 equal pieces. Niki says that her cake is bigger than Marco’s because it has more pieces.
EXPLAIN why Nikki is not correct.
A "sufficient" explanation:
An "insufficient" explanation: