Lesson: Composing and Decomposing 3D Shapes Mathematics • 1st Grade

In this lesson, we will learn how to compose 3D shapes to make a composite shape and decompose composite shapes into smaller shapes.

Sample Question Videos

Q1:

Daniel and Natalie have both built a model out of shapes. Daniel has used fewer cubes than Natalie.

Which picture is Natalie’s?

Q2:

How many cones are there?

Q3:

Emma has these shapes.

Pick the model she can make with all the shapes.

Hint: Her shapes might be of different colors.