Choose Operations

Overview

In this 30-minute lesson, students determine whether a real-world problem requires addition, subtraction, multiplication, or division. They will use pictures, action clues, manipulatives, and estimation to choose an operation before solving and checking. This lesson builds on students’ understanding of the four operations and prepares them to solve measurement, money, and data problems independently.

Learning intentions

Students will be able to:

• Identify the action happening in a real-world problem.
• Choose addition, subtraction, multiplication, or division.
• Solve a one-step problem using a picture, model, or equation.
• Estimate or check whether an answer is reasonable.

Success criteria

• I can identify what is happening in the story.
• I can choose an operation that matches the action.
• I can solve and show my thinking.
• I can check that my answer makes sense.

Curriculum links

• Measurement and Data — use the four operations to solve real-world problems involving measurement quantities and represent quantities with diagrams.
• Measurement and Data — use relative sizes and equivalents within a measurement system when problems require conversion.
• Measurement and Data — interpret and solve addition and subtraction problems from displayed measurement data.
• Number and Operations in Base Ten — compare and reason about multi-digit whole numbers.

Lesson structure (30 minutes)

1. 0–4 min · Hook and activate. Open with the introduction slides showing four picture situations: joining, taking away, equal groups, and sharing equally. Ask, “What is happening in each picture?” Students briefly act out or describe one situation with a partner, then share an action word such as “more,” “fewer,” “each,” or “shared.”

2. 4–10 min · I do: model the choice process. Use the modeling slides to model a four-operation choice board with icons: plus for joining, minus for taking away or finding a difference, groups for equal groups, and sharing circles for division. Read aloud: “There are 4 bags with 3 apples in each bag.” Think aloud: “I see equal groups, so multiplication fits: 4 × 3 = 12.” Model the routine: identify the action, choose an operation, solve, and check with a picture or estimate. Emphasize that students should use the meaning of the story, not only a clue word.

3. 10–16 min · We do: sort and solve. Display one story card at a time using the interactive sorting slides. Students move to or point under the correct operation on the smartboard, explain their choice, and solve with counters or connecting cubes. Use these stories: 4 bags with 3 apples each; 30 stickers shared by 5 children; 25 toys and 10 more; and 40 birds with 12 flying away. Invite different students to identify the action, select the operation, and check the answer. For a class of eight, have partners share one set of manipulatives and switch roles after each problem.

4. 16–25 min · You do: independent practice. Distribute the four-operation picture problem worksheet. Students solve the four pictured one-step problems and complete the operation question: “Each and equal groups often suggest which operation?” Require a picture, equation, or short explanation for at least two problems. Students should circle the operation first, then solve and check. Read every problem aloud, pause to highlight the action, and allow calculator use after the class model for students who need it.

5. 25–28 min · Partner check and discuss. Use the checking and discussion slides to display answers without immediately revealing the operation. Partners compare one solution using the prompts, “The action is ___,” “I chose ___ because ___,” and “I checked by ___.” Ask one pair to explain how multiplication and division can describe equal groups in different ways.

6. 28–30 min · Exit assessment. Finish with the question stems exit ticket slips. Each student answers one prompt independently: “What action helps you choose multiplication?” or “How do you check an answer?” Collect the slips with the worksheet and quickly review whether each student identified an action, selected an operation, solved, and checked.

Resources

• the complete Choose Operations slide deck
• the four-operation picture problem worksheet
• the question stems exit ticket slips
• Smartboard or interactive display
• Counters, connecting cubes, or small manipulatives
• Four operation icons or a choice board
• Pencils, highlighters, and optional calculators

Assessment

• During modeling and sorting, listen for students naming the action before choosing an operation. Ask, “How does the story show that operation?”
• Review worksheet responses for operation choice, correct equations, use of a model, and reasonable answers. Note whether errors come from operation selection or computation.
• Use the exit slip to identify students who can explain a choice. Reteach with acted-out stories and two operation choices for students who need further support.

Differentiation

• Support students with operation icons, picture clues, counters, an acted-out story, and a four-step visual routine: identify, choose, solve, check. Initially offer two operation choices rather than four.
• Read every problem aloud and provide a dyslexia-friendly copy with a clear sans-serif font, generous spacing, minimal written text, and highlighted action words. Allow students to answer orally, point to an icon, draw, or dictate an explanation.
• Pair students strategically and give roles such as reader, model builder, operation chooser, and checker. Rotate roles so all students participate.
• Allow calculator use after the operation has been modeled and selected. Extend ready students by asking them to write a new story for a given operation or explain how the same numbers could represent a different operation.