Detailed description

Two rectangles, one under the other.

1. The top rectangle is shaded to show half in pale blue (labelled $$\dfrac{1}{2}$$) and one quarter in grey (labelled $$\dfrac{1}{4}$$). One quarter is unshaded. A bracket is used to show the entire rectangle is one whole. The word 'whole' is written above the bracket.
2. The rectangle below is shaded to show two quarters in pale blue and one quarter in grey. One quarter is unshaded. A bracket is used to show the entire rectangle is one whole. The word 'whole' is written above the bracket.