Lesson 8-3

LET'S BUILD Use Reasoning to Solve Problems Involving Shapes and Data

For more help with this lesson, view the Visual Learning Animation or the Another Look Video.

MATH HELP AT HOME

Sample Additional Practice Exercise 1

Look at the cylinder and cone in the box, identify the shape of their flat surfaces, and circle the objects that have a flat surface with that shape.

Geometric shapes and real world objects. On the left, circle and a cylinder and cone in a box. On the right, a candle, a soup can, and an ice cream cone all circled. A toy cube and block not marked.

A cylinder has two flat surfaces that each look like a circle. A cone has one flat surface that looks like a circle. The candle, can, and cone each have at least one flat surface shaped like a circle. So, circle those objects. The other shapes do not have any flat surfaces shaped like a circle.

HOME ACTIVITY

Surfaces of 3-D Shapes

MATERIALS

Can, Cube-Shaped Box

ACTIVITY

Show your child a can and ask him or her to identify the flat surfaces (circles). Show your child a box shaped like a cube and ask him or her to identify the flat surfaces (squares). Take turns identifying other objects that have flat surfaces that are circles or squares.