These STEM lesson plans give teachers five adaptable starting points for hands-on learning. Each has a clear goal, materials, a suggested sixty-minute structure and an assessment check. They are planning frameworks, not a claim that a lesson “works every time” or has been tested in every classroom. Adjust reading demands, group size, tools and supervision for your learners and school policy.
STEM Lesson Plans: A Shared Classroom Structure
For each session, reserve five minutes to introduce the challenge, ten to model the key idea, twenty-five for investigation or building, ten for testing and explanation, and ten for cleanup and an exit check. A class new to the materials may need a simpler task or a second session.
Preview the activity before teaching. Check access needs, material quantities and the room layout. Use adult-controlled small loads and low-level tests, and keep small objects away from children who may mouth them. Avoid hot tools, mains electricity and unapproved downloads.
1. Paper Bridge Design
Goal: explain how changing paper shape can affect a small bridge. Materials: paper, tape, two stable supports per group, a tray and a small agreed load.
Introduce the need to cross a short gap. Demonstrate the span and testing rule, then ask teams to sketch two designs using the same material allowance. Let them build one and predict where it may bend.
An adult places the agreed load centrally and stops at visible sagging or movement. Teams revise one feature and compare the result under the same conditions. Never test with body weight or increase the load indefinitely.
Assessment: the learner identifies what changed and explains how the evidence informed the revision. Support: provide two fold options to compare. Extension: compare equal-material designs and discuss joint movement separately from bending. See TeachEngineering’s bridge activity for a separate structured resource.
2. Unplugged Algorithm Challenge
Goal: write and debug a precise sequence of instructions. Materials: paper grids, arrow cards and a paper character.
Model one instruction on a tabletop grid, defining the starting direction and what “turn” means. A partner then follows a learner’s sequence exactly. Use a fixed target and a small number of steps so the task remains manageable.
Introduce a deliberate ambiguity, such as “go over there”, and ask how to improve it. Keep the challenge on the table rather than blindfolding children or sending them through obstacles.
Assessment: the learner locates an instruction causing the wrong result and replaces it. Support: use large picture cards and fewer steps. Extension: identify a repeated sequence and represent it with a repeat instruction.
3. Paper-Towel Fair Test
Goal: identify a variable and explain why comparison conditions matter. Materials: equal paper samples, water, droppers, shallow trays and record sheets.
Ask how water spreads through two paper types. Agree the sample size, number of drops, placement and observation time. Let teams predict before testing, then repeat with fresh dry samples.
Record the wet area or another clearly defined observation. Do not assume that the largest spread measures total absorbency. Discuss whether sample thickness, timing or an accidental spill could have affected the result.
Assessment: learners name the changed variable and two things kept consistent. Support: provide a simple drawing record. Extension: compare repeat results and explain uncertainty. The Science Buddies investigation guide offers background for teachers.
4. Scratch Story Sequence
Goal: connect an event with an ordered sequence of actions. Materials: approved devices, a prepared Scratch example and paper story cards.
Show a character that starts an action when the green flag is clicked. Ask learners to predict the next two actions before running it. In pairs, create a short sequence with movement or speech, changing one block at a time.
Swap partner roles so both learners explain decisions. Save a working copy before adding sound or visual details. If devices fail, use the paper cards to describe the same sequence.
Assessment: the child identifies the trigger and predicts how swapping two actions changes the story. Support: supply a small starter project. Extension: add a repeat block and explain its effect. Use Scratch Ideas for official project prompts.
5. Schoolyard Observation and Classification
Goal: sort observations using an explicit rule. Materials: clipboards, pencils and an approved observation area, or photographs if outdoor access is unsuitable.
Agree boundaries and supervise according to school policy. Observe plants and objects without tasting, picking unknown materials or disturbing wildlife. Learners draw or record visible features, then group their observations by a stated rule such as shape or texture.
Ask another group to apply the rule to a new example. If it is ambiguous, revise the description. This teaches that classification depends on the question and criteria, not just making neat piles.
Assessment: learners explain the grouping rule and recognise an example that is difficult to classify. Support: use a small prepared image set. Extension: compare two valid classification systems for the same observations.
Use One Simple Assessment Rubric
Look for a clear plan, a recorded observation and an explanation linked to evidence. A polished model is not enough if the learner cannot explain a decision. Offer spoken, drawn and written ways to show understanding.
After teaching, note which step required more time and what to simplify next time. Explore our Teachers hub and STEM projects hub to build a sequence of lessons rather than an isolated activity.
