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Which subject	Mathematics
What topic	Decomposing 10
What length (min)	30
What age group	Year or Grade 1
Class size	20
What curriculum
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Number of slides	5
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Lesson plan

Lesson Plan: Decomposing 10

Subject

Mathematics

Topic

Decomposing 10

Grade/Age Group

Year or Grade 1 (ages 6-7)

Length of Lesson

30 minutes

Number of Students

20

Objectives

• Students will understand how to decompose the number 10 into different pairs of numbers.
• Students will be able to identify and record different combinations that add up to 10.
• Students will engage in collaborative learning while practicing decomposing numbers.

Materials

• Whiteboard and markers
• Paper and pencils
• Ten-frame manipulatives (either physical or digital)
• Worksheets with exercises on decomposing 10
• Small counters or blocks

National Curriculum Alignment

This lesson aligns with the Common Core State Standards for Mathematics (CCSS.MATH.CONTENT.1.OA.B.3), where students learn to represent and solve problems involving addition and subtraction.

Lesson Structure

Step Number	Step Title	Length	Details
1	Introduction	5 minutes	Briefly explain what decomposing numbers means. Introduce the target number 10.
2	Group Activity	10 minutes	Divide students into pairs. Using ten-frames, have students find different combinations of numbers that sum to 10.
3	Guided Practice	5 minutes	As a class, discuss the combinations discovered. Write them on the board (e.g., 0+10, 1+9, 2+8, etc.).
4	Independent Practice	5 minutes	Distribute worksheets for students to complete on their own, finding pairs that equal 10.
5	Review and Homework Setup	5 minutes	Review the combinations learned in the lesson. Assign practice problems on decomposing 10 for homework. Remind students that they will submit their homework without presentation in class.

Assessment

• Observe students during group activities to assess their understanding and engagement.
• Review completed worksheets to evaluate individual comprehension of the concept.

Homework

• Complete a worksheet with a set of problems that ask students to decompose the number 10 in various ways.
• Encourage students to practice with family members, discussing the pairs that make 10 but submit completed work on their own when they return to class.

Lesson script