Florida B.E.S.T. MA.3.GR.1.3

Math3rd GradeDescribe and identify relationships between lines and classify quadrilaterals.

The Standard

Draw line(s) of symmetry in a two-dimensional figure and identify line-symmetric two-dimensional figures.

Florida B.E.S.T. Standards for Mathematics

Teacher's field guide

What Students Need to Do: Students decide whether a flat shape can be divided into matching mirror halves. They draw the line or lines where the shape could fold onto itself.
What Mastery Looks Like: Students identify whether a two-dimensional figure has line symmetry. They draw each line of symmetry so the two parts match exactly when folded.
Common Misconceptions: Students may think any line that splits a shape into equal areas is a line of symmetry. They may also miss diagonal lines or assume tilted shapes cannot be symmetric.
How to Assess It: Give students four shapes and ask them to circle each line-symmetric shape, then draw every line of symmetry it has.

Lesson moves

Give students paper shapes to fold, then trace each fold that makes the two halves match exactly.
Show a square with vertical, horizontal, and diagonal lines, then ask students to explain which lines show symmetry and why.
Play a symmetry sort where partners place shape cards under zero, one, two, or more lines of symmetry.
Photograph logos, road signs, or building fronts, then mark any lines of symmetry visible in each image.

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