Net Builder

Overview

In this lesson, students connect 3D objects with 2D nets by exploring prisms and pyramids on the IWB, then building and sketching a net and a corresponding 3D shape. They will practise identifying key faces and edges and using clear sketches to show the connection between net and solid.

Learning intentions

Students will:

• make and sketch nets of 3D objects (prisms and pyramids)
• match a net to the correct 3D shape by identifying faces and where they join
• describe the features of faces (edges/corners) using correct shape language
• use their sketches to communicate how a 2D net becomes a 3D object

Success criteria

I can:

• draw a net that would fold to make a prism or pyramid
• explain which faces join to form the sides and base
• sketch my net clearly and label the key parts I used

Curriculum links

• MA2-3DS-01: students make and sketch model and nets of three-dimensional objects including prisms and pyramids
• Two-dimensional spatial structure (MA2-2DS-01/MA2-2DS-03): students compare 2D shapes and describe features that make up parts of nets
• Mathematics practices: use visual reasoning and communication to connect 2D representations to 3D objects

Lesson structure (60 minutes)

1. 0–7 min · Hook on the IWB. Teacher displays a “mystery net” image on the introduction slides and asks: “Which 3D shape do you think this net makes, and why?” Students do a quick think-pair-share, using one sentence with an edge/face/corner word.

2. 7–15 min · Model net-to-solid thinking. Teacher uses the introduction slides to show a prism net folding sequence (highlighting which rectangles form the side faces and which face is the base/ends). Students point to the matching faces on screen and complete a two-step response: “This net has ___ faces/edges, so it will make a ___.”

3. 15–22 min · Guided compare: prism vs pyramid. Teacher returns to the introduction slides and compares two nets side-by-side (one prism net, one pyramid net). Students use sentence starters: “A prism net has ___ matching side faces,” and “A pyramid net has ___ triangular faces that meet at a point.”

4. 22–35 min · Main task: build a net (hands-on) and record (sketch). Teacher distributes the shapes and nets worksheet and places template cards or cut-out net options on tables while projecting reference folds on the introduction slides. Students choose one of two prompts shown by the teacher (prism or pyramid). They either:

• construct the net with provided paper pieces (prism: rectangles; pyramid: triangles), then
• sketch their completed net in the worksheet box and label the base face. Teacher circulates with prompts: “Which faces join first?” “Where will the corners go?”

5. 35–47 min · IWB check: rotate, align, and justify. Teacher uses the introduction slides to display 3 student-style sketches (anonymous) and asks the class to vote which one matches a given 3D model shown on the same slide. Students justify their vote using “joins” and “faces” language.

6. 47–55 min · Share and refine. Teacher returns to the introduction slides for a “Common issues” slide (e.g., missing a side face, triangular faces not arranged to meet at the apex). Students revise their sketch if needed and add one short sentence on the worksheet: “My net makes a ___ because ___.”

7. 55–60 min · Plenary and exit check. Teacher finishes on the introduction slides with one final net image and asks: “Is it a prism net or pyramid net? Show your reason using one feature.” Students write a one-line exit response on the back of the shapes and nets worksheet.

Resources

• the introduction slides (IWB slides with net-to-solid visuals and guided prompts)
• the shapes and nets worksheet (one page: build + sketch + short explanation)
• Net templates or cut-out faces (rectangles for prisms; triangles for pyramids) plus glue sticks or tape
• Coloured paper or cardstock pieces (optional) for clear face distinction
• Scissors (teacher-managed if required), pencils, rulers
• Question stems displayed on IWB for language support (joins, faces, base, edges, corners)

Assessment

• Formative during task: teacher observation checklist for correct net features (faces included, base identified, clear joins)
• Formative during IWB vote: students provide a justification sentence using accurate vocabulary
• Exit ticket (1 line) from the shapes and nets worksheet: identify prism vs pyramid net and justify with one feature

Differentiation

• Support: provide sentence starters on the worksheet (“My net makes a ___ because ___”) and offer pre-drawn net outlines for students needing scaffolding
• Support: colour-code faces (e.g., all side faces the same colour) to help students see which faces join
• Extension: students draw an additional net variation for their chosen solid (e.g., different arrangement) and state whether it will still fold correctly
• EAL/SEN: allow oral explanation to a partner before writing; use the IWB reference images repeatedly and keep instructions short and visual