Making and Unmaking Simple Changes

Active learning helps first graders grasp reversible and irreversible changes because hands-on experiences let them see and touch the evidence of each change. When students manipulate real materials, the differences between pressing a crease flat and never having a crease become clear in ways that pictures or words alone cannot convey.

• 1st Grade
• Science
• 4 activities
• 15 min–35 min

Learning Objectives

1. Classify changes made to common materials as reversible or irreversible.
2. Compare the outcomes of bending, tearing, folding, cutting, and breaking a given material.
3. Predict whether a specific change made to a material can be easily undone.
4. Explain, using descriptive vocabulary, what happens to a material when it is bent, torn, or cut.

Experiential Learning

⏱ 25 min·Pairs

Sorting Activity: Can I Undo It?

Give each pair of students a set of identical paper strips. Students bend one strip, tear another, fold a third, and cut a fourth. They then attempt to reverse each change and sort them into two groups: 'easy to undo' and 'hard to undo'. Partners discuss their reasoning before sharing with the class.

Prepare & details

Describe what happens when you bend, tear, or cut a material.

Facilitation Tip: During the Sorting Activity: Can I Undo It?, circulate with a hand lens and ask each student to show you a change they labeled reversible and explain how they know.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Gallery Walk

⏱ 30 min·Small Groups

Gallery Walk: Before and After

Post six stations around the room, each showing an image of a material change (folded aluminum foil, torn fabric, snapped pretzel stick, crumpled paper, cut string, bent wire). Students walk with a clipboard and mark each as reversible or irreversible, then justify one choice in writing before a whole-class debrief.

Prepare & details

Compare changes that are easy to undo with changes that are not.

Facilitation Tip: During the Gallery Walk: Before and After, give each student two sticky notes, one for questions and one for new wonderings, to post next to the photos they study.

Setup: Wall space or tables arranged around room perimeter

Materials: Large paper/poster boards, Markers, Sticky notes for feedback

• Understand
• Apply
• Analyze
• Create
• Relationship Skills
• Social Awareness

Think-Pair-Share

⏱ 15 min·Pairs

Think-Pair-Share: The Impossible Fix

Hold up a torn piece of paper and ask: 'What would I need to make this look exactly like it did before?' Students think quietly, then discuss with a partner, then share ideas whole class. Guide students to notice that tape changes the paper further and the tear itself cannot simply be reversed.

Prepare & details

Predict if a simple change to a material can be easily put back the way it was.

Facilitation Tip: During the Think-Pair-Share: The Impossible Fix, provide sentence stems on sentence strips so pairs have language support for their discussion.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

Experiential Learning

⏱ 35 min·Small Groups

Collaborative Notebook: Change Journal

Small groups receive clay, paper, and a craft stick. They record what each material looks like before, then make three changes to each and sketch the results. The group labels each change as reversible or irreversible and compares notes with another group at the end.

Prepare & details

Describe what happens when you bend, tear, or cut a material.

Facilitation Tip: In the Collaborative Notebook: Change Journal, model how to draw a line of symmetry on a folded shape so students transfer the skill to their own entries.

Setup: Varies; may include outdoor space, lab, or community setting

Materials: Experience setup materials, Reflection journal with prompts, Observation worksheet, Connection-to-content framework

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Teaching This Topic

Teach this topic by letting students test their own predictions first, then guiding them to notice what they missed. Avoid telling them the answer up front; instead, ask them to compare their ‘fixed’ paper with a fresh sheet side by side. Research shows that when students articulate their own observations aloud, misconceptions surface naturally and can be addressed in the moment.

What to Expect

By the end of these activities, students should confidently sort materials into reversible and irreversible changes and explain their choices using evidence from their work. They should notice small details such as ragged edges or remaining creases that prove a change was not fully undone.

Watch Out for These Misconceptions

Common Misconception

During Sorting Activity: Can I Undo It?, watch for students who think pressing a crumpled paper flat returns it to its original state.

What to Teach Instead

Have students place the ‘un-crumpled’ paper next to a never-crumpled sheet and use a hand lens to compare crease lines; prompt them to describe what they see that proves the change left evidence.

Common Misconception

During Sorting Activity: Can I Undo It?, watch for students who treat cuts and tears as the same irreversible change.

What to Teach Instead

Give each student a torn piece and a cut piece, then ask them to trace the edges with their fingers and describe the differences; record their observations on a class chart labeled ‘Straight vs. Ragged’.

Common Misconception

During Sorting Activity: Can I Undo It?, watch for students who assume harder changes are always irreversible.

What to Teach Instead

Provide thick cardboard and ask students to bend it and then try to return it to flat; have them explain why bending is still reversible even though it took more force.

Assessment Ideas

Quick Check

After Sorting Activity: Can I Undo It?, provide each student with a strip of paper and scissors. Ask them to tear the paper, then try to put it back exactly as it was, and finally fold the paper. Listen as they describe each change using the words reversible or irreversible.

Exit Ticket

During Gallery Walk: Before and After, give each student a small card. On one side, they draw a reversible change; on the other, an irreversible change. They write the change type below each drawing.

Discussion Prompt

After Think-Pair-Share: The Impossible Fix, present a pipe cleaner, a rubber band, a piece of clay, and a dry leaf. Ask students to choose one material that can bend or shape easily and return to its original form, and explain why the others cannot be so easily undone.

Extensions & Scaffolding

• Challenge: Offer pipe cleaners, aluminum foil, and wax paper strips. Ask students to find three reversible changes and three irreversible changes, explaining their choices in writing.
• Scaffolding: Provide picture cards of each change type so students can match the action to the word before sorting real materials.
• Deeper exploration: Invite students to create a simple comic panel showing a material changing and whether it can be undone, using speech bubbles to label the type of change.

Key Vocabulary

bend	To curve or force something into a different shape without breaking it. The material can often be straightened again.
tear	To pull apart or rip something forcefully. This often creates permanent damage that cannot be easily fixed.
fold	To bend something over on itself so that one part covers another. This change is usually easy to undo.
cut	To divide something using a sharp tool. This can create permanent changes, like making a piece of paper smaller.
reversible	A change that can be undone, returning the material to its original state. For example, unfolding a piece of paper.
irreversible	A change that cannot be undone, making it difficult or impossible to return the material to its original state. For example, tearing a piece of paper.