Solving Word Problems (Subtraction)

Children in Class 2 learn subtraction best when they connect abstract numbers to stories they know from their daily lives. When we turn word problems into games and hands-on tasks, we help students notice subtraction cues naturally without feeling like they are doing ‘math drills’ alone.

• Class 2
• Mathematics
• 4 activities
• 15 min–25 min

Learning Objectives

1. Analyze simple word problems to identify keywords indicating subtraction.
2. Calculate the difference in quantities using subtraction for given word problems.
3. Explain the reasoning for choosing subtraction over addition in a word problem context.
4. Compare the results of solving a 'how many left' problem using subtraction versus addition.

Collaborative Problem-Solving

⏱ 15 min·Pairs

Keyword Hunt Game

Students read word problems on cards and circle subtraction keywords. They draw pictures to show the subtraction. Pairs discuss and solve one problem together.

Prepare & details

Differentiate between word problems that require addition and those that require subtraction.

Facilitation Tip: During the Keyword Hunt Game, give each pair a magnifying glass so they feel like real detectives searching for hidden clues in the text.

Setup: Flexible seating that allows clusters of 5-6 students; desks can be grouped in rows of three facing each other if fixed furniture limits rearrangement. Wall or board space for displaying group norm charts and the session agenda is helpful.

Materials: Printed problem brief cards (one per group), Role cards: Facilitator, Questioner, Recorder, Devil's Advocate, Communicator, Group norm chart (printable poster format), Individual reflection sheet and exit ticket, Timer visible to the class (board countdown or projected timer)

• Apply
• Analyze
• Evaluate
• Create
• Relationship Skills
• Decision-Making
• Self-Management

Collaborative Problem-Solving

⏱ 20 min·Small Groups

Toy Take-Away Stories

Use classroom toys to act out subtraction word problems. Children remove objects as per the story and count what is left. Share solutions with the class.

Prepare & details

Justify your choice of operation for a given word problem.

Facilitation Tip: For Toy Take-Away Stories, use soft toys and small baskets so students can physically ‘remove’ items to see the remaining count.

Setup: Flexible seating that allows clusters of 5-6 students; desks can be grouped in rows of three facing each other if fixed furniture limits rearrangement. Wall or board space for displaying group norm charts and the session agenda is helpful.

Materials: Printed problem brief cards (one per group), Role cards: Facilitator, Questioner, Recorder, Devil's Advocate, Communicator, Group norm chart (printable poster format), Individual reflection sheet and exit ticket, Timer visible to the class (board countdown or projected timer)

• Apply
• Analyze
• Evaluate
• Create
• Relationship Skills
• Decision-Making
• Self-Management

Collaborative Problem-Solving

⏱ 25 min·Individual

Problem Solver Cards

Provide mixed addition-subtraction cards. Students sort them into piles and solve subtraction ones. Check with peers.

Prepare & details

Predict what would happen if you used addition instead of subtraction to solve a 'how many left' problem.

Facilitation Tip: When using Problem Solver Cards, have students first whisper the answer to a partner before writing anything to reduce pressure.

Setup: Flexible seating that allows clusters of 5-6 students; desks can be grouped in rows of three facing each other if fixed furniture limits rearrangement. Wall or board space for displaying group norm charts and the session agenda is helpful.

Materials: Printed problem brief cards (one per group), Role cards: Facilitator, Questioner, Recorder, Devil's Advocate, Communicator, Group norm chart (printable poster format), Individual reflection sheet and exit ticket, Timer visible to the class (board countdown or projected timer)

• Apply
• Analyze
• Evaluate
• Create
• Relationship Skills
• Decision-Making
• Self-Management

Collaborative Problem-Solving

⏱ 20 min·Whole Class

Class Story Chain

Build a class subtraction story one sentence at a time. Each child adds a subtraction step and solves the running total.

Prepare & details

Differentiate between word problems that require addition and those that require subtraction.

Facilitation Tip: In the Class Story Chain, start the first sentence yourself so the class hears a clear model of how to continue the subtraction story.

Setup: Flexible seating that allows clusters of 5-6 students; desks can be grouped in rows of three facing each other if fixed furniture limits rearrangement. Wall or board space for displaying group norm charts and the session agenda is helpful.

Materials: Printed problem brief cards (one per group), Role cards: Facilitator, Questioner, Recorder, Devil's Advocate, Communicator, Group norm chart (printable poster format), Individual reflection sheet and exit ticket, Timer visible to the class (board countdown or projected timer)

• Apply
• Analyze
• Evaluate
• Create
• Relationship Skills
• Decision-Making
• Self-Management

Teaching This Topic

Start by reading aloud a simple subtraction story and asking students to act it out with counters. This shows that subtraction is about ‘taking away’ or finding what is ‘left over’, not just ‘getting less’. Avoid teaching keywords in isolation; instead, pair each keyword with a matching action so the word always points to a clear subtraction picture. Research from primary classrooms shows that when children draw quick sketches before calculating, their accuracy improves and misconceptions drop.

What to Expect

By the end of these activities, every child should be able to underline the subtraction keyword in a problem, write the correct number sentence, and draw a simple picture to check their answer. They should also confidently explain why addition would not fit the same story.

Watch Out for These Misconceptions

Common Misconception

During Keyword Hunt Game, watch for students who label every large number as the number to subtract.

What to Teach Instead

Hand them a red marker and ask them to circle only the words that describe an action like ‘take away’, ‘left’, or ‘flew away’ so they see the keyword must match the story, not just the size of the number.

Common Misconception

During Toy Take-Away Stories, watch for students who count the toys they removed instead of the toys left on the table.

What to Teach Instead

Place a small sticky note on the basket with the word ‘left’ written on it and remind them to count what remains after the take-away.

Common Misconception

During Problem Solver Cards, watch for students who add the numbers even when the story clearly shows a decrease.

What to Teach Instead

Ask them to read their number sentence aloud while pointing to each part of the picture they drew; this usually makes the mismatch obvious.

Assessment Ideas

Quick Check

After Keyword Hunt Game, present the following problem orally: ‘Maya had 12 marbles. She lost 5 marbles on her way home. How many marbles does Maya have now?’ Ask students to write the number sentence and the answer on their mini whiteboards. Circulate and check if they wrote 12 – 5 = 7 and not 12 + 5 = 17.

Exit Ticket

After Toy Take-Away Stories, give each student a card with the problem: ‘There were 9 biscuits in a jar. 4 biscuits were eaten. How many biscuits are left?’ Ask students to underline the keyword that tells them to subtract and write the final answer on the back of the card before they leave.

Discussion Prompt

During Class Story Chain, present this scenario: ‘Arjun collected 7 postcards. He gave 3 postcards to his sister.’ Ask students: ‘Which operation should we use to find how many postcards Arjun has left? What would happen if we added 7 and 3 instead?’ Listen for explanations that mention ‘fewer left’ and ‘total would grow’ to confirm their understanding.

Extensions & Scaffolding

• Challenge: Provide problems that mix ‘take away’ and ‘how many more’ language in the same set and ask students to sort them into two columns before solving.
• Scaffolding: Seat struggling learners with a peer buddy and give them a strip of paper with the keyword list taped to the desk as a visual reminder.
• Deeper exploration: Invite students to create their own two-step word problem using subtraction, exchange with a partner, and solve each other’s problems.

Key Vocabulary

Subtraction	The process of taking away one number from another to find out how many are left or the difference between them.
Keywords	Specific words in a word problem, like 'left', 'take away', 'difference', that tell you to subtract.
Difference	The amount by which one number or quantity is greater or less than another; found by subtracting.
How many left	A phrase in a word problem that asks for the remaining quantity after some items have been removed or used.