Mathematics · Primary 2

Active learning ideas

Word Problems with Money

Active learning with real money and visual models helps Primary 2 students grasp the concrete nature of money problems. When they handle coins and notes while drawing bar models, abstract operations become tangible, building confidence and accuracy in solving 1- and 2-step word problems.

• MOE Syllabus Outcomes
• MOE: Numbers and Algebra - P2
• MOE: Problem Solving - P2

• 25–40 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Mystery Object
• 35 min · Small Groups

Role-Play: Corner Shop

Assign roles as customers and shopkeepers. Provide play money and price tags for items. Customers buy 1-2 items, pay, receive change, and draw bar models to check. Rotate roles after each transaction and discuss one key problem as a class.

How does a bar model help us understand money word problems?

Facilitation Tip

During Role-Play: Corner Shop, circulate and listen for students to verbalize the amount paid and the cost before calculating change, reinforcing the order of subtraction.

What to look for

Present students with a scenario: 'Ravi bought a toy car for S$3.50 and paid with a S$5 note. Draw a bar model to show this. How much change should Ravi get?' Observe their bar models and calculations.

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

Activity 02

• Mystery Object
• 25 min · Pairs

Bar Model Match-Up

Prepare cards with word problems, bar model sketches, and answers. In pairs, students match all three sets for money scenarios. They explain matches to each other, then create one new set to share.

When a problem asks for change, what operation do we use and why?

Facilitation Tip

In Bar Model Match-Up, have students compare their models in pairs, pointing to the parts that represent payment and cost to correct misalignments.

What to look for

Give each student a slip of paper with a problem: 'A packet of biscuits costs S$1.20. Siti bought two packets. She paid with a S$5 note. How much change did she receive?' Students write their answer and one sentence explaining how they found it.

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

Activity 03

• Mystery Object
• 30 min · Small Groups

Change-Making Relay

Set up stations with problem cards on buying. Teams line up; first student solves step 1 with coins, passes to next for step 2 and bar model. First team done correctly wins. Review as whole class.

How do we check that our answer is reasonable for an everyday shopping situation?

Facilitation Tip

For Change-Making Relay, set a timer and rotate groups every three minutes so students practice quick calculations and peer feedback.

What to look for

Ask students: 'Imagine you bought a pencil for S$0.80 and a book for S$2.50. You gave the shopkeeper S$4.00. How do you know if the change you received is correct?' Guide them to explain the steps and check for reasonableness.

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

Activity 04

• Mystery Object
• 40 min · Pairs

Problem Inventor Workshop

Individually brainstorm a shopping story with dollars and cents. Pairs combine into 2-step problems, draw bar models, solve, and swap with another pair to check reasonableness.

How does a bar model help us understand money word problems?

What to look for

Present students with a scenario: 'Ravi bought a toy car for S$3.50 and paid with a S$5 note. Draw a bar model to show this. How much change should Ravi get?' Observe their bar models and calculations.

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

A few notes on teaching this unit

Teachers should model the habit of labeling each part of the bar model clearly, including cents, to avoid confusion. Avoid rushing to abstract symbols; instead, pair drawing with physical money to build understanding. Research shows that students who articulate their reasoning while solving problems develop stronger problem-solving skills.

Students will confidently decide whether to add or subtract by explaining their steps aloud and using bar models to show relationships between amounts. They will also check the reasonableness of their answers, such as confirming that change is always less than the payment.

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Watch Out for These Misconceptions

• During Role-Play: Corner Shop, watch for students who reverse the subtraction by subtracting cost from payment.

  Prompt them to place the S$5 note on the table first and count up the coins given as change, reinforcing that payment minus cost equals change.

• During Bar Model Match-Up, watch for students who draw separate bars for dollars and cents instead of combining them.

  Have them use play money to build the total amount and then draw one continuous bar, labeling both dollars and cents together.

• During Problem Inventor Workshop, watch for students who assume every money problem requires addition.

  Ask them to act out their invented problem with play money, showing payment and cost clearly, and guide them to identify when subtraction is needed.

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Methods used in this brief

• Mystery Object