Which rectangle does NOT show 12 same-size squares?

Answer 1

To have 12 same size squares in a rectangle the grid of squares will be 1x12, 2x6 or 3x4. This means that the ratio of the length to the width is either 1:12, 2:6, 3:4, 4:3, 6:2 or 12:1. If the ratio of the length to width is none of those, then 12 same-size squares cannot fit.

Answer 2

Any rectangle in which the ratio of the lengths of sides is not one of

• 1:12,
• 2:6, or
• 3:4.