Squares 1, 2 and 3 all have edges of length 1 unit.
The top edge of square 2 is split into equal parts of length ½.
The left hand edge of square 3 is split into equal parts of length ½.
The top and bottom edges of square 3 is split into lengths ¼, ¼, and ½.
The squares are split up into smaller shapes.
What can you say about those shapes?
Which shapes are the same?
Which shapes are similar?
The squares have area 1 square unit. What are the areas of the smaller shapes?