Mathematics · Year 1

Active learning ideas

Measuring Mass with Non-Standard Units

Active learning transforms abstract weight comparisons into tangible experiences children can see, feel, and discuss. When students lift, place, and watch objects balance in real time, they build lasting understanding of mass beyond size or shape. The hands-on nature of these activities turns misconceptions into moments of discovery, making measurement meaningful from the first cube counted.

• National Curriculum Attainment Targets
• KS1: Mathematics - Measurement

• 20–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Balance Challenges

Prepare four stations with balance scales, cubes, and objects like erasers, books, and fruits. Small groups rotate every 10 minutes, predict outcomes, balance items, and record unit counts. End with a class share of surprising results.

Explain how a balance scale helps us compare weights.

Facilitation Tip

During Station Rotation: Balance Challenges, place one heavier object in each station so students experience immediate feedback on their predictions.

What to look for

Present students with a balance scale and two different classroom objects (e.g., an eraser and a book). Ask: 'Which object do you predict is heavier? Use the scale to check. Now, use 5 cubes to measure the eraser. How many cubes balance the eraser?'

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Outdoor Investigation Session
• 25 min · Pairs

Pairs: Pencil Case Match

Provide cubes and scales. Pairs balance their pencil case against cubes, count the matching number, then swap cases to verify partner's count. Discuss why same cubes ensure fairness.

Construct a method to find out how many blocks weigh the same as your pencil case.

Facilitation Tip

For Pairs: Pencil Case Match, assign each pair different pencil cases so they can compare results and discuss why some take more cubes than others.

What to look for

Show students two sets of blocks measuring the mass of the same object, but one set uses large blocks and the other uses small blocks. Ask: 'Why does one set of blocks need more items than the other to balance the pencil case? What should we do to make sure our measurements are fair and accurate?'

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

Activity 03

• Outdoor Investigation Session
• 30 min · Whole Class

Whole Class: Prediction Tournament

Display paired objects. Class votes on heavier item, tests on central scale, and tallies correct predictions. Award points to teams for accuracy and explanations.

Justify why we need to use the same type of unit when measuring mass.

Facilitation Tip

In Whole Class: Prediction Tournament, introduce a timer to create urgency and encourage quick, thoughtful predictions before testing on the scale.

What to look for

Give each student a small card. Ask them to draw a picture of a balance scale with two objects on it. They should circle the heavier object and write one sentence explaining why they chose that one.

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

Activity 04

• Outdoor Investigation Session
• 20 min · Individual

Individual: Mass Hunt Journal

Children select five classroom items, sketch them, predict cube units needed, and measure using a personal scale. They reflect on matches versus predictions.

Explain how a balance scale helps us compare weights.

Facilitation Tip

In Individual: Mass Hunt Journal, provide a checklist with pictures so students know exactly which classroom items to measure and record.

What to look for

Present students with a balance scale and two different classroom objects (e.g., an eraser and a book). Ask: 'Which object do you predict is heavier? Use the scale to check. Now, use 5 cubes to measure the eraser. How many cubes balance the eraser?'

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

A few notes on teaching this unit

Teach this topic through guided exploration, not lecture. Let students manipulate materials first, then name what they observed. Avoid telling them the answer when the scale tips; instead, prompt them to explain why. Research shows that young learners construct understanding when they test ideas and revise thinking based on evidence. Use small group discussions to reinforce vocabulary like heavier, lighter, balance, and equal.

Students will confidently use a balance scale to compare masses, predict outcomes, and measure classroom items with identical units. They will explain why uniform units matter and recognize that size does not always determine weight. Clear verbal or written justifications show growing precision in comparison and counting skills.

---

Watch Out for These Misconceptions

• During Station Rotation: Balance Challenges, watch for students who assume the larger object always tips the scale.

  Ask them to test a large feather and a small stone with cubes on the scale, then share their surprise. Encourage them to predict and test again to see that size and mass can differ.

• During Pairs: Pencil Case Match, watch for students who mix different small objects as measuring units.

  Have them redo the measurement using only one type of unit, like cubes. Ask the group to explain why mixing units makes results unreliable and how uniform units create fair comparisons.

• During Whole Class: Prediction Tournament, watch for students who confuse mass with size or length when interpreting the scale.

  Use identical boxes filled with different cube counts. After the activity, sort the boxes by cube count and ask students to describe what changed inside the boxes, not outside the boxes.

---

Methods used in this brief

• Stations Rotation
• Outdoor Investigation Session