Spatial Reasoning: Odd One Out Flashcards

Three figures are open shapes (C, U, L) and one is a closed shape (O). Which is the odd one out?

Answer: O shape

The O shape is a fully closed figure, while C, U, and L are all open shapes.

Four tiles each contain a pattern of stripes: horizontal, vertical, diagonal left, and one with a solid fill. Which is the odd one out?

Answer: Solid fill

The solid fill tile has no line pattern at all, unlike the other three.

Which of the following is NOT a quadrilateral: rectangle, rhombus, trapezoid, or pentagon?

Answer: Pentagon

A pentagon has 5 sides, while rectangles, rhombuses, and trapezoids all have exactly 4 sides.

Four sequences show shapes growing by adding one side each step (triangle→square→pentagon→hexagon), except one sequence that skips a step. Which sequence is the odd one out if Sequence C jumps from triangle directly to pentagon?

Answer: Sequence C (skips square)

Sequence C skips the square (4 sides), breaking the pattern of adding one side per step.

Three shapes are concave polygons (have an indentation) and one is a convex polygon with no indentations. Which is the odd one out?

Answer: Regular hexagon (convex)

The regular hexagon is convex with no inward-pointing vertices, unlike the other three shapes.

Four block letter shapes are shown from above: T, L, I, and X. Which letter shape has the MOST right-angle corners?

Answer: X shape

An X shape has 12 interior and exterior right-angle corners, more than T (8), L (4), or I (8).

Four figures show pairs of overlapping shapes: three pairs overlap partially (sharing an area), but one pair of shapes is entirely separate with no overlap. Which is the odd one out?

Answer: Pair C (no overlap)

Pair C has no overlapping area between the two shapes, unlike the other three pairs.