4.G.A.3 Grade 4 · GeometryRecognize a line of symmetry for a two-dimensional figure as a line across the figure such that the figure can be folded along the line into matching parts.Common Core State Standards for Mathematics, as adopted in the Massachusetts Curriculum Framework for Mathematics (2017), Grade 4.
Play the game: Shapesfree, no sign-up →Shapes are built, turned, cut and stacked, not just named. A square is an area you lay out yourself; a cube is that square stacked into layers.
Every page is free and open — nothing to install, no account, and it works on a phone or a classroom board. Every number has its own color: 1 red, 2 orange, 3 yellow, 4 green, 5 blue, 6 purple, 7 brown, 8 pink, 9 cyan, and a number is that many colored dots.
4.G.A.1Draw and find right, acute and obtuse angles, and perpendicular and parallel lines4.G.A.2Sort shapes by parallel and perpendicular sides and kinds of angle; right trianglesColorMyMath · getridoftheteacher.com · every number has its own color, and a number is that many colored dots. Matching a game to a standard is a judgement call; the official text is at doe.mass.edu.