We are not sure what the error is here.
Answer:
The student only counted the shaded blocks
Step-by-step explanation:
[tex]3 \div \frac{1}{4} = 3 \times \frac{4}{1} = \frac{12}{1} = 12[/tex]
so it would be
[tex] \frac{3}{12} = \frac{1}{4} [/tex]