Two-Digit Addition

Lesson Objective

By the end of the 30-minute lesson, Key Stage 1 students should be able to add two-digit numbers accurately using a variety of strategies. This lesson will align with the UK National Curriculum for Mathematics (Year 1, Number - Addition and Subtraction) aiming to extend pupils' understanding beyond basic addition.

Materials Needed

• Whiteboard and markers
• Printed worksheets (provided below)
• Small manipulatives (counters or cubes)
• Interactive number line (either on the board or printed)
• Mini whiteboards and markers for each student
• Reward stickers for positive reinforcement

Lesson Outline

Introduction (5 minutes)

1. Welcome and Objective: Greet the students and explain that today they will learn a fun and interesting way to add two-digit numbers. Use engaging language to keep enthusiasm high.
2. Warm-up Activity: Quickly review single-digit addition with the whole class to activate prior knowledge. Use manipulatives like counters or cubes to visually illustrate a few simple problems (e.g., 3 + 4 or 5 + 6).

Direct Instruction (10 minutes)

1. Explain Two-Digit Addition: Introduce the concept of adding two-digit numbers. Use clear, age-appropriate language.

   • Example: "Let’s look at 23 + 15. We start by adding the numbers in the ones place: 3 + 5 = 8. Next, we add the numbers in the tens place: 2 + 1 = 3. So, 23 + 15 equals 38."

2. Demonstrate Using a Number Line: Draw a number line on the board and show step-by-step how to add two-digit numbers using it.

   • Example: Place 23 on the number line. Move 10 steps to the right (for the tens place), landing on 33. Then move 5 more steps to the right (for the ones place) to reach 38.

3. Interactive Practice: Invite a few students to come up to the board and solve additional two-digit addition problems using the number line.

Guided Practice (5 minutes)

1. Use Mini Whiteboards: Hand out mini whiteboards and markers to each student. Pose two-digit addition problems one by one and have students solve them on their whiteboards.
   • Monitor their work and provide immediate feedback. Use praise and reward stickers to encourage correct answers and effort.

Independent Practice (7 minutes)

1. Worksheet Activity: Distribute the provided worksheets that contain a series of two-digit addition problems.
   • Encourage students to use the number line or manipulatives if they get stuck. Walk around to offer individual support.

Quiz (3 minutes)

1. Quick Quiz: Orally quiz the students with 3-4 two-digit addition problems. Ask each student to solve one problem and explain their method.

Conclusion (3 minutes)

1. Review and Reflect: Recap the lesson by asking students to share one thing they learned about adding two-digit numbers. Highlight correct answers and encourage sharing of different methods used.
2. Preview Next Lesson: Give a teaser about the next lesson, which might involve subtraction of two-digit numbers, to keep their interest piqued.

Worksheet (To be printed)

Name: ___________________

1. 34 + 12 = ______
2. 45 + 23 = ______
3. 29 + 17 = ______
4. 56 + 20 = ______
5. 38 + 15 = ______
6. 47 + 26 = ______

Challenge: Draw a number line to solve 52 + 19.

Quiz Questions (Oral)

1. What is 22 + 14?
2. What is 31 + 25?
3. Solve 16 + 13.
4. Add 27 + 18.

Assessment

• Formative: Observe students during guided practice for understanding and strategy use.
• Summative: Evaluate the worksheet and oral quiz responses to gauge mastery of two-digit addition.

Extension Activities

• Challenge students who grasp the concept quickly with word problems involving two-digit addition.
• Introduce simple subtraction of two-digit numbers for advanced learners.

By following this detailed lesson plan, students will engage with the material through different modalities, ensuring a robust understanding of two-digit addition in an enjoyable and inspiring manner.