Free worksheets · Kindergarten
Count the Corners of Shapes: Rhombus to Octagon Worksheet
Count the corners of a rhombus, trapezoid, pentagon, hexagon and octagon and write the number in the Corners box.
Free printable
Count the Corners of Shapes: Rhombus to Octagon
5 questions, one page, US Letter. Print it and do it on paper.
On the sheet: Count each corner once. Write the number in the Corners box. A circle and an oval have no corners.
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About this worksheet
Every shape on this page has straight sides and 4 to 8 corners: a rhombus, a trapezoid, a pentagon, a hexagon and an octagon.
Counting corners carefully, one at a time with no repeats, is the same steady counting a child uses everywhere. It also prepares them to sort shapes by what they have in common.
A worked example
An octagon. How many corners?
- Put a dot by the top-left corner and say "1."
- Go around to the right, touching each corner: "2, 3, 4, 5, 6, 7, 8."
- The next corner has your dot, so stop.
- Write 8 in the Corners box.
Answer: 8
The common mistake
What it looks like: Counting the same corner twice on a shape with many corners.
Why it happens: On a hexagon or octagon the corners are close together and look alike, so the place where counting began is easy to lose.
How to fix it: Put a small dot by the first corner before counting, and stop when the finger reaches the dot again. Counting the sides afterward is a good check: the two numbers match.
Ten minutes a day, on paper. We plan what comes next.
A printed page and a pencil. No screen, no login for your child. Snap a photo when they’re done: AI scores it, and what they missed comes back on the sheets that follow.
- Mon Count the Corners of Shapes: Rhombus to Octagon
- Tue What they missed, back again
- Wed The next step, when they’re ready
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