2.8.D
The Standard
compose two-dimensional shapes and three-dimensional solids with given properties or attributes
Texas Essential Knowledge and Skills for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students combine smaller shapes or solids to make a new figure that matches given clues. They use properties such as sides, vertices, edges, and faces to check their work.
What Mastery Looks Like
- Students select and combine pieces to match a set of clues. They check the completed figure by counting its sides, vertices, edges, or faces.
Common Misconceptions
- Students may count lines between pieces as sides or faces of the finished figure. They may think turning a shape changes its name or confuse edges, vertices, and faces.
How to Assess It
- Give students two triangles and four cubes. Ask them to make a four-sided figure and a rectangular prism, then list one property of each.
Lesson moves
Ways to Teach It
Give pairs pattern blocks and solid blocks, then have them build figures that match property cards.
Ask students to draw a figure with six sides and explain how each piece helped form the whole.
Play Build My Shape, where students choose pieces to match a clue before a partner checks the result.
Find classroom objects shaped like composed solids, then model each object with cubes, cones, cylinders, or rectangular prisms.
Keep exploring
Related Standards
- 1.6.F
compose two-dimensional shapes by joining two, three, or four figures to produce a target shape in more than one way if possible
- 2.8.A
create two-dimensional shapes based on given attributes, including number of sides and vertices
- K.6.F
create two-dimensional shapes using a variety of materials and drawings
- K.6.D
identify attributes of two-dimensional shapes using informal and formal geometric language interchangeably
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