Title: Birthday Cake
Domain
Standard
Objective:
Vocabulary
Materials
Grouping students
Launch: Introduce Task
Geometry
3.G.2
Students can divide a variety of shapes into equal parts
Students can explain their reasoning
Students can model the division of shapes into equal parts(area)
Area, equal, fraction
Pattern blocks, grid paper, paper pencil, color pencils
☐ Individual ☒ Partner ☒ Group size:
Time:5 min
Hook/Intro
Task
Picture of hexagon shaped cake, different cake shapes
Jane mom bought a hexagon shaped cake for her birthday party. Jane is not sure how many students will be coming to her party. She wants to have a plan of how to cut her cake up into equal pieces. What are the different ways she can cut her cake equally so that each friend has an equal amount of cake?
Explore: Monitor and Facilitate Time: 25 min
Starter Questions
Clarifying questions
Extension Task
What does equal amount mean?
Can you use pattern blocks?
Are the sizes equal? Can you think of any other ways?
Give a different cake shape pan. Octagon, etc.
Label each piece of cake
If no one showed up, how much of the cake would she be eating in fraction terms?
Debrief: Choose specific students to share Time:2 min/presenter
Solutions to look for
Questions to clarify
Cutting in fourths, sixths, third, twelfths,
Did any students label the pieces
Does the cake have to be cut exactly the same

Is it possible to cut the cake into 5 th or 7 th ? Why?
Assessment: What teacher is looking/listening for
See
Hear
Picture of how they divided their hexagon cake
Pieces need to be equal

Jane mom bought a hexagon shaped cake for her birthday party. Jane is not sure how many students will be coming to her party. She wants to have a plan of how to cut her cake up into equal pieces. What are the different ways she can cut her cake equally so that each friend has an equal amount of cake?