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Which subject	Mathematics
What topic	Subtraction within 20
What length (min)	30
What age group	Year or Grade 1
Class size	20
What curriculum
Include full script
Check previous homework
Ask some students to presents their homework
Add a physical break
Add group activities
Include homework
Show correct answers
Prepare slide templates
Number of slides	5
Create fill-in cards for students
Create creative backup tasks for unexpected moments

Lesson plan

Topic

Subtraction within 20

Objectives

• Students will be able to subtract numbers within 20.
• Students will develop an understanding of subtraction as taking away.
• Students will enhance their problem-solving skills through subtraction exercises.

Grade/Age Group

Grade 1 (Ages 6-7)

Subject

Mathematics

Length of Lesson

30 minutes

Class Size

20 students

National Curriculum

This lesson aligns with the Common Core State Standards for Mathematics, specifically:

• CCSS.MATH.CONTENT.1.OA.B.3: Apply properties of operations as strategies to add and subtract.
• CCSS.MATH.CONTENT.1.OA.C.5: Relate counting to addition and subtraction.

Materials

• Whiteboard and markers
• Number line (printed or drawn)
• Subtraction worksheets
• Counters (e.g., small blocks, chips)
• Interactive subtraction games (optional)
• Exit tickets

Lesson Structure

Step Number	Step Title	Length	Details
1	Introduction	5 min	Begin with a quick review of addition. Introduce the concept of subtraction as taking away with examples. Use a number line.
2	Teacher Demonstration	10 min	Solve a few subtraction problems on the board using counters and a number line. Demonstrate how to write subtraction sentences.
3	Guided Practice	5 min	Distribute subtraction worksheets for guided practice. Walk around to assist students as needed.
4	Independent Practice	5 min	Have students complete a set of subtraction problems independently. Offer counters for those who need assistance.
5	Review and Feedback	3 min	Go over the answers as a class. Address any common mistakes and provide positive reinforcement.
6	Homework Assignment	2 min	Assign subtraction problems for homework. Ensure students understand they will turn it in without presenting.

Assessment

• Observe student participation and understanding during guided and independent practice.
• Review homework for accuracy and understanding of subtraction concepts.

Additional Notes

• Ensure to provide extra support for students who struggle with the concept.
• Offer extension activities for advanced students, such as word problems involving subtraction.
• Make use of technology if available, such as educational apps that focus on subtraction skills.

Lesson script