NNAT3 Level B cheat sheet
NNAT3 Level B · Keep the key ideas within reach.
Spatial Visualization
Mental rotation: track one distinctive feature (a notch, a dot, an asymmetric corner) rather than the whole figure to judge orientation.
A rotation preserves shape, size, and handedness; a mirror image reverses handedness, which is the key test between rotation and reflection.
Paper folding: unfold in reverse order of the folds; each unfold mirrors the hole across the fold line, so one hole can become two, four, or eight.
Holes on a fold line stay single; holes away from the fold line double with each unfold that crosses them.
Paper folding with diagonal folds produces holes reflected across diagonal axes, giving diagonal patterns rather than simple grids.
Cube and net problems: opposite faces of a cube never touch; two faces separated by exactly one face in a straight net row are opposite.
Transparent or stacked overlays: combine shapes by union or intersection as stated, and check line segments that coincide rather than double.
Embedded-figure items: the target shape must appear at the same size and orientation unless rotation is allowed; count sides to reject near matches.