P5/P6 Math: Fraction of Shaded Triangle in a Square Grid

A triangle occupies space in a grid container many smaller squares.

Students are expected to find out the fraction of the grid that is shaded (or unshaded) without knowing the dimensions of the square grid.

Such questions are common in Paper 1 of P5 and P6 exams,
Calulcator usage is not allowed.

In each of the figures, what fraction of the figure is unshaded?