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Count Sides and Vertices of Flat Shapes

Written by Adi Ackerman, Head Teacher

"Count Sides and Vertices of Flat Shapes" is written for 1st Grade (Ages 6-7), and it covers Common Core 1.G.A.1. If your little one is a year younger but already steady on geometry, the page still works. You may just need to read the instructions out loud. And if they are older and identifying shapes never quite stuck, this is a short review rather than busywork.

Popular with 1st Grade teachers · Downloaded 366 times
Count Sides and Vertices of Flat Shapes
Count Sides and Vertices of Flat Shapes

1st grade math worksheet: count the sides and vertices of 8 flat shapes, including a hexagon and an octagon, in a table. Answer key included. Part of our identifying shapes geometry collection. Aligned to Common Core standards.

How do I use this worksheet?

Before handing out the worksheet, briefly introduce the concept with a short oral warm-up or a visual model on the board. Let students work through the first item together as a class, then finish the rest independently or with a partner, encouraging them to talk through their thinking: "What strategy are you using? How do you know that is right?" After completing the worksheet, review any missed problems together and discuss the reasoning rather than just the answer. For extra support, let students use manipulatives or draw pictures alongside the written problems. These identifying shapes worksheets work well as daily practice, homework, or a focused review activity.

What students will practice

  • Students will learn that a vertex is a corner where 2 sides meet.
  • Students will count the sides and vertices of 8 flat shapes, up to an 8-sided shape.
  • Students will write each count in a table and see that sides and vertices match.


Curriculum Links

Common Core State Standards

Geometry · 1st Grade

1.G.A.1

Standard: Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes.

View all 1.G.A.1 worksheets →

Find this in the curriculum

Browse the grade, subject, and topic this belongs to.

FAQ

How do I use this identifying shapes worksheet?

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Before handing out the worksheet, briefly introduce the concept with a short oral warm-up or a visual model on the board. Let students work through the first item together as a class, then finish the rest independently or with a partner, encouraging them to talk through their thinking: "What strategy are you using? How do you know that is right?" After completing the worksheet, review any missed problems together and discuss the reasoning rather than just the answer. For extra support, let students use manipulatives or draw pictures alongside the written problems. These identifying shapes worksheets work well as daily practice, homework, or a focused review activity.

What does this worksheet teach?

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Count the sides and vertices of 8 flat shapes, including a hexagon and an octagon, in a table. A vertex is a corner where two sides meet. Two or more are called vertices. The directions on the page read: Count the sides of each shape and write the number in the Sides box. Then, count the vertices and write the number in the Vertices box. An answer key is included.

Can I use this identifying shapes worksheet for homeschool or classroom?

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Yes, both. We made it for 1st Grade geometry, and the page works the same whether it lands on a kitchen table or a center rotation. At home, most families go through it together and talk the answers out loud, and that talking is where most of the learning happens with identifying shapes. In class it runs well as independent work while you pull a small group. Print one copy or thirty, whichever the day needs.

What attributes do 1st graders use to identify shapes?

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Students use number of sides, number of corners (vertices), and whether sides are straight or curved to distinguish and identify shapes.

Why is identifying shapes in various orientations important?

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CCSS 1.G.A.1 emphasizes that shape identity doesn't change with orientation - a triangle rotated or flipped is still a triangle, and recognizing this prevents orientation-dependent misconceptions.

How does shape identification in 1st grade connect to geometry in higher grades?

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Reliable shape identification is prerequisite to classifying shapes by properties, understanding congruence, and computing area and perimeter in 3rd through 5th grade.

What geometry do 1st graders learn?

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CCSS 1.G.A.1 asks 1st graders to tell defining attributes, like 3 sides, from non-defining ones, like color or size, and to draw shapes that have the defining attributes. 1.G.A.2 adds building with flat and solid shapes, such as a rocket made of a cone, a cylinder and a cube.

Which solid shapes should a 1st grader know?

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The cube, sphere, cone, cylinder and rectangular prism. The names of 3D shapes pages match them to objects like a basketball, a cereal box and a birthday hat, and ask which solids roll, which stack and which do both.

What shape patterns do 1st graders work on?

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Patterns with longer units, such as ABC, AABB and ABBC, patterns that change color and shape at once, growing patterns and patterns where a shape turns or flips. Finding the pattern unit, the part that repeats, is the key step.

Do these 1st grade geometry worksheets have answer keys?

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Yes. All 30 sheets have an answer key. Drawing pages, where answers vary, show a sample drawing and what to accept.

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Worksheet Details

Grade1st Grade
SubjectMath
TopicGeometry
Standard1.G.A.1
Pages1 page
DifficultyMedium

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