Addition and Subtraction Word Problems Lesson Plan

Complete lesson plan for teaching addition and subtraction word problems to 1st graders with detailed phases, objectives, and assessment strategies.

Lesson Plan Overview
📚 + 📚 = Success!
Addition and Subtraction Word Problems

Lesson Overview

This lesson introduces 1st grade students to solving addition and subtraction word problems by identifying key words and applying problem-solving strategies.

Learning Objectives:

Students will be able to:

  • Identify key words that indicate addition or subtraction
  • Translate word problems into mathematical equations
  • Solve simple addition and subtraction word problems
  • Explain their problem-solving process
🎯
INTRODUCTION
5-10 min
📚
DEVELOPMENT
15-20 min
✏️
PRACTICE
10-15 min
✅
ASSESSMENT
5-10 min
Key definitions:

Word Problem: A math question presented in sentence form

Key Words: Words that indicate the operation needed (addition or subtraction)

Problem-Solving Strategy: Steps to follow when solving word problems

5-Step Problem-Solving Strategy:
  1. Read Carefully: Read the problem completely
  2. Find Keywords: Identify operation words
  3. Circle Numbers: Mark important numbers
  4. Draw Pictures: Visualize the problem
  5. Solve & Check: Do math and verify answer
Tip 1: Use manipulatives like counters or blocks for hands-on learning.
Tip 2: Encourage students to retell the problem in their own words.
Tip 3: Practice with real-life scenarios students can relate to.
Tip 4: Repeat the same problem format with different numbers.
Common Challenge: Students may see "and" and always add without reading the question.
Success Indicator: Students can independently identify operation words and solve problems.
Lesson Phases and Activities
1 Introduction Phase (5-10 minutes)
Warm-up Activity
Review addition and subtraction facts using visual aids and manipulatives. Introduce the concept of "word problems" as math stories.
Activity Steps:

1. Show students a picture of 3 apples and 2 more apples

2. Ask: "How many apples are there altogether?"

3. Write the equation: 3 + 2 = 5

4. Explain: "This is a word problem - a math question in a sentence!"

Teaching Notes:

• Start with familiar concepts before introducing word problems

• Use visual aids to connect concrete and abstract thinking

• Emphasize that word problems are just math in story form

Expected Outcome:

Students understand that word problems are math questions told in sentences and can be solved using addition or subtraction.

2 Development Phase (15-20 minutes)
Key Words Introduction
Introduce addition and subtraction key words through examples and interactive activities.
Key Words Categories:

Addition Words: more, altogether, total, sum, combined, plus, increase

Subtraction Words: left, remaining, fewer, less, difference, take away, minus

Interactive Activity:

1. Present sample word problems

2. Have students identify key words

3. Determine if the problem requires addition or subtraction

4. Solve the problem together

Students learn to identify operation words and apply appropriate strategies.
Teaching Strategy:

• Use color coding: green for addition words, red for subtraction words

• Create anchor charts with key words

• Practice with multiple examples of each type

3 Guided Practice (10-15 minutes)
Collaborative Problem Solving
Students work in pairs to solve word problems using the problem-solving strategy.
Guided Practice Steps:

1. Provide structured worksheets with word problems

2. Students identify key words and circle numbers

3. Partners discuss their approach

4. Solve and share solutions with class

Support Strategies:

• Provide sentence frames: "This problem uses _____ because _____"

• Offer manipulatives for struggling learners

• Use think-aloud strategies to model thinking process

Assessment Check:

Observe students as they work, noting their ability to identify key words and apply problem-solving strategies.

Practice Problems and Assessment
4 Independent Practice Problems
Problem Set A: Addition

1. Tom has 4 pencils. His teacher gives him 3 more pencils. How many pencils does Tom have altogether?

2. There are 5 birds in a tree. 2 more birds fly to the tree. How many birds are there now?

3. Sarah collected 6 seashells at the beach. Then she found 4 more. How many seashells does she have in total?

Problem Set B: Subtraction

1. Maya had 8 cookies. She ate 3 cookies. How many cookies are left?

2. There were 7 balloons tied to the fence. 2 balloons flew away. How many balloons are remaining?

3. Ben had 9 stickers. He gave 4 stickers to his friend. How many stickers does Ben have now?

Problem-Solving Process:

1. Read the problem carefully

2. Circle the key words

3. Underline the numbers

4. Draw a picture if needed

5. Write the equation

6. Solve and check

Answer Key:

Problem Set A: 1) 7, 2) 7, 3) 10

Problem Set B: 1) 5, 2) 5, 3) 5

5 Assessment and Extension
Formative Assessment
Evaluate student understanding through observation, exit tickets, and problem-solving tasks.

Exit Ticket Questions:

1. Name one word that tells you to add.

2. Name one word that tells you to subtract.

3. Solve: "Jake has 5 marbles. He finds 3 more. How many does he have altogether?"

Extension Activities:

• Create original word problems for classmates to solve

• Use larger numbers (within 20) for advanced students

• Introduce problems with missing addends

Assessment Criteria:

✓ Correctly identifies operation words

✓ Sets up appropriate equation

✓ Solves accurately

✓ Explains reasoning clearly

Students demonstrate mastery of word problem solving strategies.
Success Indicators:

Students can independently solve addition and subtraction word problems by identifying key words and applying problem-solving strategies.

Questions & Answers

Question: How can I differentiate this lesson for students with varying abilities? Some of my students struggle with basic addition while others are ready for more complex problems.

Answer: Here are effective differentiation strategies:

  • Leveled Worksheets: Provide problems with smaller numbers (5 or less) for struggling students, larger numbers (up to 20) for advanced learners
  • Manipulative Support: Allow concrete materials for all students, but encourage mental math for advanced learners
  • Partner System: Pair stronger students with those needing support
  • Choice Boards: Offer different problem types based on readiness
  • Extension Activities: Provide multi-step problems for early finishers

Focus on the process rather than just the answer. All students should be able to identify key words even if they need extra support with computation.

Question: Sometimes I see "and" in word problems. Should I always add when I see "and"? Like "I have 3 cats and 2 dogs" - do I add them?

Answer: Great question! "And" connects information, but the operation depends on the question:

  • If the question asks "total" or "altogether": YES, add them (3 + 2 = 5 pets total)
  • If the question asks about just one group: NO, keep them separate
  • Always read the entire sentence to understand what's being asked

Example: "I have 3 cats and 2 dogs. How many pets altogether?" → Add: 3 + 2 = 5

But: "I have 3 cats and 2 dogs. How many cats?" → Answer: 3 cats (no addition needed)

Question: What are some effective ways to practice these skills at home? How can I support my child's learning without overwhelming them?

Answer: Here are supportive home practice strategies:

  • Daily Integration: Use real-life situations like setting the table or sharing snacks
  • Short Sessions: 10-15 minutes of focused practice daily is better than longer sessions
  • Positive Reinforcement: Celebrate effort, not just correct answers
  • Visual Aids: Use drawings, fingers, or small objects for counting
  • Game Approach: Turn practice into games like "math treasure hunts"

Keep it fun and low-pressure. The goal is building confidence and understanding, not speed or perfection!