Free Line of Symmetry Worksheets for Grade 1 – Yes or No

Free Line of Symmetry Worksheets for Kindergarten – Yes or No

These free printable line of symmetry worksheets ask kindergarten and first grade children a single clear question about each picture: if you folded the shape along the dotted line, would the two halves match exactly? Children circle yes or no. This is deliberately not a worksheet that asks children to draw the line of symmetry themselves, because a square has four lines of symmetry and a circle has more than anyone can count, so drawing one line could never be marked fairly. With the line already drawn there is always one right answer. Every page has three shapes where the line works and three where it does not, so children cannot get through by guessing the same answer each time, and the shapes include some with no symmetry at all, such as the parallelogram. The first page explains the idea with a heart. The last page is an answer key. Just download, print, and fold!

Is that a line of symmetry? The fold test and the rectangle trap

A line of symmetry is a line that would let a shape fold exactly onto itself. Asking whether a given line qualifies is harder than drawing a symmetrical picture, because the child has to test rather than produce, and because some lines look convincing and are wrong.

What your child is actually learning

This is the checking half of symmetry, and it teaches children to test a claim rather than judge by appearance. The reliable method is the fold test: imagine folding along the line and ask whether the two sides would land exactly on top of one another. Not roughly, exactly. Children also discover here that shapes can have more than one line of symmetry, or none at all.

How to work through these pages

Cut out a few of the shapes and actually fold them the first time. The physical fold gives children a mental image to use later, and it settles arguments that talking cannot. Once folding is the habit, ask them to predict before folding, then check. Predicting and being wrong is far more instructive than being told.

The mistakes to expect

The rectangle diagonal. A diagonal line across a rectangle looks like it should work and does not, and nearly every child gets this one wrong at first. Fold a paper rectangle corner to corner and let them see the overhang.
Assuming every shape has a line of symmetry. Many do not.
Finding one line and stopping. A square has four; a circle has infinitely many.
Judging by whether the two halves are the same size rather than mirror images. Equal area is not the same as symmetry.

What to teach next

Counting all the lines of symmetry a shape has is the usual extension, and it works well with regular shapes where the answer matches the number of sides. Drawing the missing half of a picture is the companion skill if it has not been done yet.

Questions parents ask

Why is the diagonal of a rectangle not a line of symmetry?

Because folding along it does not make the two halves match: the long side lands on the short side. It works for a square, where all sides are equal, which is exactly what makes the rectangle case surprising.

How many lines of symmetry does a circle have?

Infinitely many, since any line through the centre works. Most first graders enjoy this answer, and it is a good demonstration that the number of lines is a property of the shape itself.