Grade 2 - Composing and Decomposing Shapes Unit
Standards covered:
- 2.8 Geometry and measurement
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2.8D
Compose two-dimensional shapes and three-dimensional solids with given properties or attributes.
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2.8E
Decompose two-dimensional shapes such as cutting out a square from a rectangle, dividing a shape in half, or partitioning a rectangle into identical triangles and identify the resulting geometric parts.
The Composing and Decomposing Shapes Unit use properties of geometric figures to take them apart and put them together in order to answer questions such as:
- How many different ways can you put pattern blocks together to form a hexagon? How can you prove each shape you have created is a hexagon?
- How can you cut a square into four identical triangles? How can you prove each of the figures is a triangle? How can you prove they are identical? If your square is ONE WHOLE, what is the fraction name of each of your identical triangles? How do you know?
Summative Assessment Task
Given a bowl of 32 square shapes, students determine how Derek can make two different squares using the squares in his bowl.
Instructional Tasks/Formative Assessments
Students determine ways to create new shapes from tangram shapes.
Students determine how many raisins will fit in a grid of nine one-inch squares.
Students determine whether or not a rectangular pan of Jello that is a not a square, can be cut into four identical triangles.
Students determine 2 ways to make a hexagon using pattern blocks other than the yellow pattern block.
The N/A classification refers to TEKS Standards that cannot be assessed through problem solving.
For this reason, tasks have not been included for these particular standards.
K.7A K.7B K.9B K.9C K.9D