GRADES 3–4 · STANDALONE THEORY
Geometry
Ten visual topics that build school foundations and stretch spatial reasoning.
TOPIC 1 · GRADE 3 FOUNDATION
Points, Lines, Segments, Rays, and Angles
Build the precise language used to describe every later picture and shape.Explore theory →TOPIC 2 · GRADE 3 FOUNDATION
Parallel, Intersecting, and Perpendicular Lines
Recognize how pairs of lines behave in shapes, maps, buildings, and patterns.Explore theory →TOPIC 3 · GRADES 3–4 BRIDGE
Triangle Detectives
Classify triangles by side lengths and by the kinds of angles they contain.Explore theory →TOPIC 4 · GRADE 3 FOUNDATION
The Quadrilateral Family
Sort four-sided shapes by parallel sides, equal sides, and right angles.Explore theory →TOPIC 5 · GRADE 3 FOUNDATION
Lines of Symmetry
Find lines that divide a figure into matching mirror halves.Explore theory →TOPIC 6 · GRADE 4 FOUNDATION
Angle Types and Benchmark Turns
Compare turns with 90° and 180° to classify acute, right, obtuse, straight, and reflex angles.Explore theory →TOPIC 7 · GRADE 4 FOUNDATION
Measure, Split, and Combine Angles
Estimate and measure angles, then use addition or subtraction to find missing parts.Explore theory →TOPIC 8 · GRADES 3–4 STRETCH LEARNING
Angle Sums Inside Shapes
Discover why triangle angles total 180° and how diagonals reveal sums for larger polygons.Explore theory →TOPIC 9 · GRADES 3–4 FOUNDATION
Area, Perimeter, and Composite Shapes
Separate the space inside a figure from the distance around it.Explore theory →TOPIC 10 · GRADES 3–4 ENRICHMENT
Moves, Mirrors, Turns, and 3-D Solids
Strengthen visualization by moving 2-D figures and connecting 3-D solids to faces, edges, and vertices.Explore theory →Sources and learning scope
Required Grade 3–4 material is distinguished from optional enrichment on every card.
- Florida B.E.S.T. Grade 3 Mathematics Instructional Guide — MA.3.GR: lines, quadrilaterals, symmetry, area, perimeter, and composite rectangles.
- Florida B.E.S.T. Grade 4 Mathematics Instructional Guide — MA.4.GR: angle classification, measurement, angle additivity, unknown angles, area, and perimeter.
- Florida B.E.S.T. Mathematics Standards — Official K-12 benchmark progression used to distinguish required learning from enrichment.