Grade 1: Step Up to Grade 2

Flat Surfaces of Solid Figures
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Flat Surfaces of Solid Figures
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Intervention Lesson D50
Math Diagnosis and
Intervention System
Intervention Lesson D50
Materials: Cylinder, cube, sphere, and cone geometric solids
1. Show the cylinder and ask children its name. Ask: Does a cylinder have any flat surfaces? It has two.
Ask: If you traced one of the flat surfaces, what shape would you get? Hold the cylinder against the
board or overhead and trace around the bottom to make a circle. Have children ring the circle.
2. Repeat with the cube and the cone similarly.
3. Show the sphere. Ask: Does a sphere have any flat surfaces? no
Flat Surfaces of Solid Figures (continued)
Look at each shape.
Circle the object that has the flat surface.
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190 Intervention Lesson D50
Intervention Lesson D50 189
Math Diagnosis and
Intervention System
Intervention Lesson D50
© Pearson Education, Inc.
Teacher Notes
Math Diagnosis and
Intervention System
Intervention Lesson D50
Ongoing Assessment
Ask: What shape is the flat surface on a can of
soup? circle
Error Intervention
If children have trouble relating a solid to the shape
of its flat surface,
then let them trace the bottoms of the geometric
solids onto a piece of paper.
If You Have More Time
Give children a cube and either a cone or a cylinder.
These can be real objects or shapes made out of
poster board. Also, provide paint so that children
can make a picture by putting the solids in the paint
and pressing them onto a piece of paper.
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