Add and Subtract Stories

Overview

Lesson 12 of 18 in the unit Math in Our World. Students interpret real-life addition and subtraction stories, represent quantities with counters and bar diagrams, choose an operation, and write an equation with a labeled answer.

Learning intentions

Students will be able to:

• Identify what a story problem is asking.
• Choose addition or subtraction to solve a real-life problem.
• Represent a problem with picture counters, a bar diagram, or an equation.
• Explain an answer using words and appropriate labels.

Success criteria

• I can identify what the story is asking.
• I can choose addition or subtraction.
• I can write an equation that matches the story.
• I can label my answer and explain what it means.

Curriculum links

• Measurement and Data — solve one-step word problems involving addition and subtraction of quantities measured in the same units.
• Measurement and Data — represent mathematical reasoning with drawings, models, and equations.
• Mathematical practice — make sense of problems, use tools strategically, and explain reasoning.

Lesson structure (30 minutes)

1. 0–3 min · Hook and connect. Open with the picture-story hook slide showing 4 apples in a basket and 3 more being added. Ask, “What could we find out?” Students turn and talk, then share whether the story might require putting together or taking away.

2. 3–15 min · Mini-lesson: I do and we do. Use the modeling and vocabulary slides to introduce altogether, more, left, difference, and equation. Read a short picture story aloud: “There are 6 books on a shelf. The teacher adds 4 more. How many books are there altogether?” Underline the important quantities and the question, draw a bar diagram, and model (6+4=10), writing “10 books” as the answer. Think aloud: “The story says more and asks how many altogether, so I choose addition.”

Next, display a second story: “There are 9 crayons. Students use 3. How many are left?” Students move picture counters, decide whether the operation is addition or subtraction, and select the correct symbol on the Smartboard. Build (9-3=6) together. Ask, “What does the 6 represent?” Students explain using the frame, “I chose ___ because the story says ___.”

3. 15–17 min · Guided directions. Display the practice instructions using the independent-practice directions. Distribute the picture-supported story-problem worksheet and counters. Model the routine: read or listen, underline quantities and the question, draw or move counters, choose an operation, write an equation, and label the answer. Students restate the steps before beginning.

4. 17–24 min · You do: story practice. Students solve three one-step classroom or shopping problems on the picture-supported story-problem worksheet. Problems include joining, separating, and finding a difference, using accessible whole numbers. Read every problem aloud. Students may use counters, sketch a bar diagram, point to an operation symbol, or give a verbal response while an adult records it. Confer with students individually and ask, “What is the story asking?” and “How do you know which operation to use?”

5. 24–29 min · Individual assessment. Students complete the five three-choice questions on the five-question assessment section. Questions require students to select addition or subtraction or solve a visual word problem. Read each question aloud, pause between items, and allow students to circle, point, speak, or use speech-to-text. Do not coach operation choices during this check.

6. 29–30 min · Plenary and collect evidence. Show the review and exit prompt. Students complete the sentence orally or on the worksheet: “I chose ___ when the story asked ___.” Invite one student to share an addition example and one to share a subtraction example. Collect worksheets and note whether each student identified the question, selected an operation, and labeled the answer.

Resources

• the complete picture-story teaching deck
• the picture-supported story-problem worksheet
• Smartboard or interactive display
• Picture counters or linking cubes
• Pencils, crayons, and highlighters
• Teacher-created bar diagram examples
• Speech-to-text device or classroom recording option

Assessment

• During modeling, check whether students connect words such as “more,” “altogether,” and “left” to an operation, while accepting that vocabulary alone is not proof of understanding.
• During practice, use student counters, bar diagrams, equations, and explanations as evidence of problem interpretation and representation.
• Score the five-question assessment for operation selection, accurate solving, and labeled answers. Record which students need support with understanding the question, choosing an operation, or calculating.

Differentiation

• Read every problem aloud and provide picture-supported text with short sentences, bold numbers, and a clearly separated question.
• Provide counters, bar diagram templates, operation-symbol cards, and sentence frames: “The story asks ___.” “I chose ___ because ___.” “My answer is ___.”
• For students needing additional support, use one-step problems with smaller numbers, repeat the story in short phrases, and allow pointing, verbal answers, drawing, or speech-to-text instead of extended writing.
• For students ready for a challenge, offer a two-step classroom or shopping story and ask them to show both equations and explain the order of their steps.