Science · Grade 1

Active learning ideas

The Three Rs: Reduce, Reuse, Recycle

Children in grade 1 learn best when they touch, move, and see how small actions build bigger habits. The Three Rs come alive when students sort real materials, redesign old objects, and measure classroom waste, turning abstract ideas into concrete routines they own.

• Ontario Curriculum Expectations
• K-ESS3-3

• 25–50 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Outdoor Investigation Session
• 30 min · Small Groups

Sorting Stations: Waste Classification

Prepare bins labeled Reduce, Reuse, Recycle, and Trash with sample items like wrappers, jars, and paper. Students in small groups sort 20 items, discuss choices, and record why each fits a category. End with a class share-out to refine decisions.

Analyze how reducing waste helps the environment.

Facilitation Tip

During Sorting Stations, place a magnifying glass and soft brush at each bin so students can closely examine labels and textures before deciding where items belong.

What to look for

Show students pictures of common items (e.g., plastic bottle, paper, glass jar, old toy). Ask them to point to or say whether each item can be reduced, reused, or recycled, and briefly explain why.

• Remember
• Understand
• Analyze
• Social Awareness
• Self-Awareness
• Decision-Making

Activity 02

• Outdoor Investigation Session
• 45 min · Pairs

Reuse Design Challenge: Object Makeover

Provide old boxes, bottles, and fabric scraps. Pairs brainstorm and build one new item, like a pencil holder from a can, then present how it reduces waste. Display creations in the classroom for ongoing use.

Design a new use for an old object that would normally be thrown away.

Facilitation Tip

For the Reuse Design Challenge, provide masking tape cut into strips beforehand so students spend time imagining rather than struggling with tape dispensers.

What to look for

Pose the question: 'Imagine you have an empty cereal box. What are three different things you could do with it instead of throwing it in the trash?' Guide students to discuss reducing, reusing, and recycling options.

• Remember
• Understand
• Analyze
• Social Awareness
• Self-Awareness
• Decision-Making

Activity 03

• Outdoor Investigation Session
• 50 min · Whole Class

Classroom Waste Audit: Real Data Collection

Over one week, the whole class tracks daily waste by weighing or counting items in categories. Graph results together, discuss patterns, and vote on one Reduce action to implement, like reusable water bottles.

Justify why recycling is a better option than throwing things in the trash.

Facilitation Tip

In the Classroom Waste Audit, assign one pair to photograph each type of waste collected so the class can review evidence before calculating totals.

What to look for

Give each student a small card. Ask them to draw one item they can reuse at home or school and write one sentence explaining how they will reuse it. Collect these as students leave.

• Remember
• Understand
• Analyze
• Social Awareness
• Self-Awareness
• Decision-Making

Activity 04

• Outdoor Investigation Session
• 25 min · Individual

Role-Play: Three Rs Scenarios

Individuals draw scenario cards, like 'What to do with a broken crayon?' Act out Reduce, Reuse, or Recycle choices for the class, who votes and explains the best option.

Analyze how reducing waste helps the environment.

What to look for

Show students pictures of common items (e.g., plastic bottle, paper, glass jar, old toy). Ask them to point to or say whether each item can be reduced, reused, or recycled, and briefly explain why.

• Remember
• Understand
• Analyze
• Social Awareness
• Self-Awareness
• Decision-Making

A few notes on teaching this unit

Teach the Three Rs by letting students experience the process firsthand; research shows kinesthetic sorting and hands-on redesign shift attitudes more than lectures. Avoid overwhelming students with too many categories—start with clear paper, plastic, and metal bins, then add compost later. Use their own waste as the text, building relevance and urgency for shared spaces like playgrounds.

By the end of these activities, students should confidently sort waste, brainstorm creative reuse ideas, collect and discuss data about classroom trash, and role-play responsible decisions in everyday scenarios. Their language will reflect care for shared spaces and confidence in their ability to make a difference.

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Watch Out for These Misconceptions

• During Sorting Stations, watch for students who assume all plastic can go in the recycling bin.

  Circulate with a small tub of water: have students test whether clean, dry plastic items float or sink, then ask them to re-sort based on the texture and label clues you provided at each station.

• During Reuse Design Challenge, watch for students who believe reuse means only fixing broken items.

  Introduce a bin of 'broken' objects alongside intact ones and ask teams to brainstorm three new uses for each before choosing one to build, shifting focus from repair to reinvention.

• During Classroom Waste Audit, watch for students who think recycled items disappear and new ones appear instantly.

  After the audit, show a short video clip of a recycling plant and ask students to draw the journey of one item from bin to new product, labeling energy and time steps to build understanding of the cycle.

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Methods used in this brief

• Outdoor Investigation Session