Building Addition Confidence

Overview

Curriculum Area: Mathematics
Grade Level: 1st Grade
Standard Addressed: California Common Core: 1.OA.C.6 – Add and subtract within 20, demonstrating fluency for addition and subtraction within 10 and using strategies such as counting on; making ten; decomposing a number leading to a ten; using the relationship between addition and subtraction; and creating equivalent but easier or known sums.

---

Lesson Objectives

By the end of this 30-minute lesson, students will be able to:

1. Use number lines as visual aids to solve addition equations up to 20.
2. Demonstrate fluency in adding numbers within 20.
3. Build a foundational understanding of addition by "counting on."

---

Materials Required

1. Printed worksheets (one per student) featuring addition equations and number lines.
2. Whiteboard and markers for teacher modelling.
3. Large visual number line (classroom display or drawn on the board).
4. Colour pencils for student interaction.

---

Schedule Breakdown

1. Warm-Up Activity (5 minutes)

Objective: Activate prior knowledge and get the students engaged.
Activity:

• Begin with a fun and interactive chant about numbers, e.g., “1, 2, buckle my shoe... Add them up, and count on through!”
• Write a simple addition problem on the whiteboard, such as 4 + 3 = __. Ask the class how they could solve it using a number line.
• Model how to use the number line to 'jump' forward to solve the problem.
• Invite one or two students to demonstrate solving similar problems on the large number line at the front of the room.

Transition: "Great job! Now that we’ve warmed up, let’s work on some problems together using number lines!"

---

2. Guided Instruction (10 minutes)

Objective: Introduce the main strategy—using number lines to solve addition problems.
Activity:

1. Display a large number line (either a physical number line or drawn on the board). Explain that we can use number lines to help us solve addition problems.
2. Write the problem 5 + 6 = __ on the board.
3. Demonstrate step-by-step how to start at 5 on the number line, count forward 6 "jumps," and arrive at 11.
4. Use another example (e.g., 8 + 4 = __) and involve the class in helping count the jumps together aloud.
5. Reinforce the "counting on" strategy and explain that the number line is a way to "see" how numbers grow when adding.

Transition: "Let’s practice together using your own number lines!"

---

3. Partner Practice (10 minutes)

Objective: Encourage interactive learning and collaborative problem solving.
Activity:

1. Distribute worksheets containing addition equations (to 20) and number lines.
2. Assign students to pairs and explain that they will work together to solve the problems on the worksheet.
3. Give clear instructions: “For each problem, start at the first number, count forward the second number on the number line, and write the answer in the blank space.”
4. Walk around the room to provide assistance and ensure students understand the task.
5. Encourage pairs to share their reasoning with each other as they work. Example dialogue to model: “I started at 7, and I counted 4 more spaces to get 11. What do you think?”

---

4. Review and Wrap-Up (5 minutes)

Objective: Check for understanding and reinforce the lesson's key points.
Activity:

1. Gather attention and quickly review one or two problems from the worksheet as a class.
   • Example: Write 9 + 5 = __ on the board and ask volunteers to come up and solve it using the classroom number line.
2. Praise effort and correct misunderstandings in a supportive way.
3. Ask reflective questions: “What did you notice about using the number line to add? How can it help us solve problems?”
4. Give a quick challenge problem orally (e.g., “What’s 10 + 3?”) and ask all students to solve it using the number line on their worksheet.

---

Worksheet Design (Included in Lesson)

Each student will receive a simple worksheet with the following features:

1. Ten problems to solve using number lines, such as:
   • 3 + 4 = __
   • 7 + 9 = __
   • 5 + 6 = __
2. Number lines provided for each problem with marks from 0–20.
3. A final challenge problem, requiring students to demonstrate counting forward on a blank number line they draw themselves.

---

Differentiation Strategies

1. For advanced learners: Include extra problems with missing addends (e.g., __ + 7 = 15) or higher sums within 20.
2. For learners needing more support: Pair them with a buddy who demonstrates confidence in using number lines. Use additional manipulatives like counters to bridge the gap before jumping to number lines.

---

Assessment

Formative:

• Observe students during partner practice to assess whether they are grasping the concept of using a number line and accurately solving problems.
• Use oral questioning in the wrap-up to evaluate understanding dynamically.

Worksheet Review:

• Collect and review the completed worksheets after class to identify students who may need reteaching or further practice.

---

Teacher Enhancement

To make the lesson memorable, offer a quick hands-on group activity at the end of the week where students "build" number lines on the floor using tape and physically "jump" to solve problems in pairs or small groups.

---

This lesson plan is designed to balance visual, kinesthetic, and collaborative learning techniques while directly addressing California standards for 1st Grade Mathematics. It actively builds confidence and foundational addition skills for young learners, ensuring an engaging and enriching math experience that feels both fun and achievable!