Grade Level: Grade 1

Duration: 50 Minutes

Subject: Mathematics

Unit Topic: Addition of 2-Digit Numbers by 1-Digit Numbers

1. Learning Objectives

• Students will be able to add a 2-digit number and a 1-digit number with a sum no greater than 99.

• Students will be able to demonstrate understanding by using various strategies such as counting on, using a number line, and drawing models.

• Students will be able to solve word problems that involve adding 2-digit and 1-digit numbers.

2. Standards Alignment

• Common Core State Standards (CCSS) for Mathematics:
• CCSS.MATH.CONTENT.1.NBT.B.5: Add within 100, including adding a 2-digit number and a 1-digit number.
• CCSS.MATH.CONTENT.1.OA.A.1: Use addition and subtraction within 20 to solve word problems.

3. Instructional Activities and Teaching Strategies

Introduction (10 minutes)

Hook: Begin the lesson with a short interactive counting game where students count objects in groups (e.g., counting apples).

Discussion: Introduce the concept of adding 2-digit and 1-digit numbers. Use examples and relate them to real-life situations, such as adding apples and oranges.

Direct Instruction (15 minutes)

Demonstration: Use a chart or whiteboard to model how to add a 2-digit number and a 1-digit number. – Use the number 25 + 5 as an example. Show how to break down the addition (25 + 5 = 28).- Highlight key steps and strategies (e.g., counting on, regrouping if necessary).

Guided Practice (10 minutes)

Group Work: Divide students into small groups and give each group a set of 2-digit and 1-digit number cards. 

Activity: Have students take turns drawing cards and solving the addition problems using manipulatives (e.g., counters, blocks) and number lines.

Independent Practice (10 minutes)

Worksheet: Distribute a worksheet with addition problems that involve 2-digit and 1-digit numbers.

Encourage students to use drawings or number lines to solve the problems.

4. Closure (5 minutes)

Review: Gather students and ask a few volunteers to share their answers and strategies used. Reinforce the different methods of adding.

Exit Ticket: Each student writes down one addition problem they solved and one method they used.

Required Materials and Resources

1. Counting objects (e.g., counters, blocks, apples)
2. Number cards (2-digit and 1-digit)
3. Whiteboard and markers
4. Chart paper for demonstration
5. Worksheets for independent practice
6. Number lines

Assessment Methods

• Formative Assessment: Observe student participation during discussions and group work, and provide immediate feedback.
• Worksheet: Evaluate the independent practice worksheets to assess individual understanding of the addition concepts.
• Exit Ticket: Review exit tickets to gauge student comprehension and identify any areas needing reteaching.

Differentiation Strategies for Diverse Learners

• For advanced learners: Provide more challenging problems that include larger 2-digit numbers or introduce simple 2-digit addition with carrying.
• For struggling learners: Use manipulatives more extensively and pair them with peer buddies for support during group work.
• Visual learners: Incorporate visual aids such as number lines and charts to enhance understanding.
• Kinesthetic learners: Include movement by having students physically act out additional problems using objects.

5. Timeline for Lesson Components

Notes:

• Ensure the classroom environment is supportive and encourages collaboration.
• Adapt teaching strategies based on real-time student feedback and understanding.

Introduction Video

PowerPoint Lesson

Worksheet