Distribute the tile shapes among children. Display the triangle in the “2D Shapes” Notebook file. Ask children to sort the shapes in front of them to find the shape that they see. Ask: What is this shape called? Agree that it is a triangle. Select the shape and rotate it to change its orientation. Ask children to decide whether or not it is the same shape!
Complete with a teacher's page PDF and a launch-and-learn Notebook file, this mini-lesson helps to achieve the following learning objectives:
• Begin to use mathematical names for flat 2D shapes and mathematical terms to describe shapes.
• Use language such as circle or bigger to describe the shape and size of solids and flat shapes.
• Visualize and name common 2D shapes and 3D solids and describe their features.
This mini-lesson meets the following Common Core State Standards for Mathematics:K.G.2: Correctly name shapes regardless of their orientations or overall size.K.G.3: Identify shapes as two-dimensional or three-dimensional.K.G.6: Compose simple shapes to form larger shapes.1.G.1: Distinguish between defining attributes versus non-defining attributes.1.G.2: Compose two-dimensional shapes or three-dimensional shapes to create a composite shape, and compose new shapes from the composite shape.This mini-lesson also meets the following NCTM Standards:• Recognize, name, build, draw, compare, and sort two- and three-dimensional shapes.• Investigate and predict the results of putting together and taking apart two- and three-dimensional shapes.