Child Development and Pedagogy · Pedagogy

A primary class mathematics teacher poses the following word problem to his students: 'Samina goes to bed at 10 minutes to 9. Kirti goes to bed 20 minutes later than Samina. What time does Kirti go to bed?' One of the students gave '20' as the answer. He explains, 'It says Kirti goes to bed 20 minutes later, so the answer must be 20.' According to Newman's Error Analysis, the answer given by the student is an example of a: